Within the brain, acetylcholine has involvement in memory, motivation, arousal, and attention. Acetylcholine originates from two major places in the brain: 1) basal forebrain and 2) the mesopontine tegmentum area. Acetylcholine originates in the basal forebrain from both the basal nucleus of Meynert and the medial septal nucleus.Chapter 4, Tissues, introduced the three major types of muscle cells: smooth, cardiac, and skeletal. Muscle tissue comprises over six hundred skeletal muscle s, in addition to cardiac and smooth muscle s. The primary focus of this chapter will be on skeletal muscles as smooth and cardiac muscle s will be discussed in later chapters.. Development of Muscle TissueSkeletal muscle is the most common type of muscle tissue found in the body and consists of highly elongated, multinucleate, non branching cells which are arranged in a parallel manner. Skeletal myocytes often measure several centimeters, or tens of centimeters in length, with the number of nuclei contained within being proportional to their length.The position of nuclei in skeletal muscle cells (myo fibers) is of particular interest, since these cells are multinucleated, with up to hundreds of nuclei (myonuclei), evenly distributed along the cell surface. Mislocalized myonuclei have been associated with a variety of muscle diseases [3] that are characterized by reduced muscle size ...Figure 3.20 Multinucleate Muscle Cell Unlike cardiac muscle cells and smooth muscle cells, which have a single nucleus, a skeletal muscle cell contains many nuclei, and is referred to as “multinucleated.” These muscle cells are long and fibrous (often referred to as muscle fibers). During development, many smaller cells fuse to form a mature muscle …This showed that nuclei of the Mdx muscle mostly resembled those from the uninjured and 14 d.p.i muscle, whereas the signature of 7 d.p.i myofibers was depleted (Fig. 4b).The ability to go back to the original length - once it stretches, its able to go back to the original length and contract. What are the functions of skeletal muscle? - Produce skeletal movement. - Maintain posture and body position. - Support soft tissue. - Regulate entering and exiting of material.The nuclei of this column gives origin to preganglionic fibres that contribute to the cranial parasympathetic outflow. These fibres end in peripheral ganglia. Postganglionic fibres arising in those ganglia (peripheral ganglia) supply the smooth muscles and glands. The nuclei from the GVE are as follows:Cardiac muscle combines properties of both skeletal and smooth muscle. Like skeletal muscle, it generally ______; and like smooth muscle it typically ______. is striated; is mononucleated. True or false: Cytosolic Ca2+ for smooth muscle contraction comes from both the sarcoplasmic reticulum and entry from the extracellular fluid through plasma ...This is the nucleus of a cell in interphase (between cell divisions). A bluish purple line around the edge of the nucleus is the nuclear envelope/nuclear membrane. The small darkly staining granules are chromatin (chromosomes). The larger dark purple structure is the nucleolus. The nucleus of a cell in interphase.smooth muscle contraction. -low energy. -not as coordinated. -can maintain tension for long periods of time. -corkscrew motion. initiation of contraction. -involuntary. -response to neuromuscular transmission, EC, or circulating ligand (eg. epinephrine) -cell recieves input from more than ONE nueron.Smooth muscle (SM) structure and function interact over many orders of spatial magnitude, ranging from the centimeter-length scale of vessels to the nanometer-length scale of cytoskeletal proteins. ... cyclic cardiac pumping exposes vascular SM (VSM) (Fig. 1) to a number of mechanical stimuli, such as transmural pressure, vascular shear strain ...Don't blink. Animals come in all different shapes and sizes, but only a few can change their shapes. Researchers in Ecuador recently reported a new species of frog that can change ...Vascular smooth muscle cells (VSMCs), as basic ingredients of the vascular wall and the sole cell type in the arterial medial layer, play critical roles in vascular physiological functions. ... For example, with the inhibition of p21, the number of senescent VSMCs induced by Ang-II was significantly decreased [145]. Following p53 inhibition ...Key ID. Cross Section | large central nuclei, uninucleated, binucleated or multinucleated, myofibrils located around periphery of cell. Longitudinal Section | large central nuclei, uninucleated, binucleated or multinucleated, striated banding pattern, intercalated disks (gap junctions), branching. Number of nuclei and myofibrils diminished in ...Study with Quizlet and memorize flashcards containing terms like Which of the following is true about smooth muscle? A) Certain smooth muscle cells can actually divide to increase their numbers. B) Smooth muscle, in contrast to skeletal muscle, cannot synthesize or secrete any connective tissue elements. C) Smooth muscle cannot stretch as much as skeletal muscle. D) Smooth muscle has well ...Prostatic smooth muscle cells consistently express nuclear AR. In the mature prostate, smooth muscle AR is believed to stimulate paracrine signaling in response to …Smooth muscles have one nucleus per cell whereas striated muscles have multiple nucleus. Explanation: Muscles that are composed of 'thin and thick' fiber-like filaments appear striated and are known as striated muscles. These muscles need more amount of energy for its regular movement and therefore is present with a large number …B. Smooth muscle is found in the walls of hollow organs. C. Cardiac muscle cells have multiple nuclei. D. Smooth muscle cells are long and cylindrical. E. There is a small amount of smooth muscle in the heart.Each FC fuses with a specific number of FCMs (2-25) and establishes a unique muscle with a specific size, shape, tendon attachment, and innervation [12,13]. Each embryonic muscle is composed of a single muscle cell with a relatively small number of nuclei, which is ideal for investigating molecular events underlying myogenesis in great detail.Smooth muscles have one nucleus per cell whereas striated muscles have multiple nucleus. Explanation: Muscles that are composed of 'thin and thick' fiber-like filaments appear striated and are known as striated muscles. These muscles need more amount of energy for its regular movement and therefore is present with a large number …Skeletal muscles function for the voluntary movements of the body. Muscle type 2) Smooth muscle cells are spindle-shaped (6), and each cell has a single nucleus (7). Unlike skeletal muscle, there are no striations. The smooth muscle acts involuntarily and functions in the movement of substances in the lumens.Where is the nuclei in skeletal muscle? Updated: 9/7/2023. Wiki User. ∙ 8y ago. Best Answer. the center.The parasympathetic nervous system (PSNS) is a division of the autonomic nervous system (ANS) that controls the activity of the smooth and cardiac muscles and glands. It works in synergy with the sympathetic nervous system (SNS), which complements the PSNS activity. The parasympathetic nervous system is also called the craniosacral division of ...Surprisingly, the results revealed an inverse relationship between nuclei numbers and reserve capacity. We propose that as myonuclear numbers increase, the range of transcriptional return on a per nuclear basis in myofibers diminishes, which accounts for both the absolute reliance developing myofibers have on nuclear accrual to establish size ...Neurons, or nerve cell, are the main structural and functional units of the nervous system.Every neuron consists of a body (soma) and a number of processes (neurites). The nerve cell body contains the cellular organelles and is where neural impulses (action potentials) are generated.The processes stem from the body, they connect neurons with each other and with other body cells, enabling the ...In both VL muscles, the average number of nuclei per cell decreased from anterior to posterior (Figure S1 C). Together, VL3 and VL4 muscles provided a significantly different, but overlapping, range of cell sizes and nuclear numbers. The different relationships of cell-size parameters and nuclear number along the larval body axis …Intestines - Outer Wall Detail (smooth muscle) Slide 1: Muscle- Skeletal Longitudinal Section and Slide 2: Muscle-Skeletal Cross Section (The questions are for the muscles listed aboved) ... The number of nuclei in each muscle cell is typically multiple, as each cell is formed by the fusion of multiple myoblasts during development.Tiny flask-shaped pits in the outer surface of the smooth muscle. helps keep high concentrations of Ca2+ produce greater effect. length difference in contracting smooth muscle. since there is no m-line, smooth muscle can get really short or really long. the filaments can really overlap.Abstract. Abstract Adult skeletal muscle fiber is a symplast multinuclear structure developed in ontogenesis by the fusion of the myoblasts (muscle progenitor cells). The nuclei of a muscle fiber (myonuclei) are those located at the periphery of fiber in the space between myofibrils and sarcolemma. In theory, a mass change in skeletal muscle ...Complete (fused) tetanus. Put the following in order of largest to smallest: a. myofibril. b. muscle fiber. c. fascicle. d. thick filament. c, b, a, d. We have an expert-written solution to this problem! An increase in the force generated by a muscle is achieved by the __________ of more motor units.Muscle tissue arises from embryonic mesoderm. Somites give rise to myoblasts and fuse to form a myotube. The nucleus of each contributing myoblast remains intact in the mature skeletal muscle cell, resulting in a mature, multinucleate cell. Satellite cells help to repair skeletal muscle cells. Smooth muscle tissue can regenerate from stem cells ...Nuclei Smooth muscle located in the wall of the digestive tract is arranged in distinct circular and longitudinal layers. Because smooth muscle fibers are splindle-shaped with a single, centrally located nucleus, cross sections of this tissue will display profiles of varying diameters, which may or may not contain the nucleus. 1000xPut these steps of cardiac muscle excitation-contraction coupling in order, from top to bottom. Put the step that doesn't belong at the bottom of the list a. Ca2+ binds to L-type Ca2+ channels, allowing Ca2+ to flow into the cytosol from the sarcoplasmic reticulum b. the membrane is depolarized by Na+ entry c. L-type Ca2+ channels open, allowing Ca2+ to enter the cytosol from the ...Smooth muscle is also present in the eyes, where it functions to change the size of the iris and alter the shape of the lens; and in the skin where it causes hair to stand erect in response to cold temperature or fear. Figure 1. Smooth Muscle Tissue. Smooth muscle tissue is found around organs in the digestive, respiratory, reproductive tracts ...In addition to skeletal muscle, two other types of muscle are found in the body: ____ muscle and ____ muscle. Fill in the blank. Cardiac/Smooth. Cardiac muscle cells are ____ and thicker then skeletal muscle cells, and they have only ____ nuclei. longer/1-2. shorter/10-20.An intercalated disc allows the cardiac muscle cells to contract in a wave-like pattern so that the heart can work as a pump. Figure 10.7.2 10.7. 2: Cardiac Muscle. Intercalated discs are part of the cardiac muscle sarcolemma and they contain gap junctions and desmosomes. Contractions of the heart (heartbeats) are controlled by specialized ...Vascular smooth muscle cells (VSMCs), as basic ingredients of the vascular wall and the sole cell type in the arterial medial layer, play critical roles in vascular physiological functions. ... For example, with the inhibition of p21, the number of senescent VSMCs induced by Ang-II was significantly decreased [145]. Following p53 inhibition ...Nuclei of smooth muscle cells. These cells show a very elongated fusiform nucleus which contains small nucleoli. The small incisures in the nucleus surface are due to a contraction of the smooth muscle fiber. Designers also selected these stock photos. Fracture shaft of fibula bone ( leg bone ) . X-ray of leg ( 2 position : side and front view )Tiny flask-shaped pits in the outer surface of the smooth muscle. helps keep high concentrations of Ca2+ produce greater effect. length difference in contracting smooth muscle. since there is no m-line, smooth muscle can get really short or really long. the filaments can really overlap.How many nuclei does smooth muscle contain? One, they are uninucleate. The sole purpose of cardiac muscle is to pump blood out of your heart to the rest of your _____. body. The cardiac muscles are thick, and the muscle fibers making up this muscle have a striated, or _____, appearance.Abstract. Skeletal muscle cells are noteworthy for their syncytial nature, with each myofiber accumulating hundreds or thousands of nuclei derived from resident muscle stem cells …VIDEO ANSWER:Hello students. Let us solve this question in this question we have to differentiate between skeletal muscle, smooth muscle and cardiac muscles. O…The nuclei are embedded in the cell membrane (5) to be just inside the cell. This type of tissue occurs in the muscles that are attached to the skeleton. Skeletal muscles function for the voluntary movements of the body. Muscle type 2) Smooth muscle cells are spindle-shaped (6), and each cell has a single nucleus (7).A smooth muscle cell is smaller in size compared to skeletal muscle cells, generally ranging from 20 to 200 micrometres in length. It possesses a spindle-shaped or elongated shape with tapered ends. Unlike skeletal muscle cells, smooth muscle cells possess a single, centrally located nucleus. Step 2. 2 of 2.Study with Quizlet and memorize flashcards containing terms like Contractile cells of the body can be classified into three major groups based on their shape, position of nuclei, presence of striations and whether they are under voluntary or involuntary control. Name the three major groups of muscle cells., Describe Skeletal Muscle Cells (shape 1), Describe Cardiac Muscle Cells (shape 2) and more.Sep 7, 2023 · Each smooth muscle cell has only 1 nucleus. Skeletal muscle cells are much bigger and are formed by the merging many cells during fetal development, so they have many nuclei. Smooth muscle is also present in the eyes, where it functions to change the size of the iris and alter the shape of the lens; and in the skin where it causes hair to stand erect in response to cold temperature or fear. Figure 4.8.1 4.8. 1: Smooth muscle tissue. Smooth muscle tissue is found around organs in the digestive, respiratory ...Smooth muscle is widely distributed throughout the body and serves diverse functions. Physiologically divided into single unit and multi unit fibers. Intracellular actin and myosin filaments generate contractile forces by a sliding filament mechanism. Contractile filaments are not arranged into sarcomeres, thus giving it a nonstriated (smooth ...How many nuclei are present in smooth muscle? Flexi Says: Smooth muscle cells are spindle-shaped, have one central nucleus, and are generally arranged in sheets or …Like smooth muscle, cardiac muscle cells contain only one nucleus. Cardiac muscle is found only within the heart. Skeletal muscle or “voluntary muscle” is anchored by tendons to the bone and is used to effect skeletal movement such as locomotion. Skeletal muscle cells are multinucleated with the nuclei peripherally …The functional role of the T tubules is to: Enhance cellular communication during muscle contraction. The role of calcium ions in muscle contraction is to: Bind to regulatory sites on troponin changing the configuration. The warm-up periodrequired of athletes in order to bring their muscles to peak performance is:Muscle Tissues. There are three types of muscle in animal bodies: smooth, skeletal, and cardiac. They differ by the presence or absence of striations or bands, the number and location of nuclei, whether they are voluntarily or involuntarily controlled, and their location within the body.Smooth Muscle (Vascular) Structure. Vascular smooth muscle cells have classically been envisaged as fusiform cells, on average 200 microns long × 5 microns in diameter, with a large central nucleus surrounded by an abundant array of endoplasmic reticulum and golgi apparatus, with the cytosol and plasma membrane tapering toward the poles.Study with Quizlet and memorize flashcards containing terms like Smooth muscle and cardiac muscle are similar in that they both A. are under involuntary control. B. are striated. C. are widely distributed in the body. D. have multiple nuclei. E. are under voluntary control., ATPase is found in A. F-actin strands. B. G-actin globular units. C. myosin heads. D. tropomyosin grooves. E. troponin ...Do you work out hard and suffer in the aftermath? Sometimes the pain can be unbearable. Care Fair recommends that you avoid working out so hard so that you're not in excruciating p...This also holds true for the multinucleated skeletal muscle fiber, as the number of diploid cell nuclei scales sublinearly with fiber volume but linearly with the fiber surface area (Hansson et al., 2020a) . FIGURE 2: Nuclear number scales in direct proportion to the surface area. (Ai) DNA content (nuclear number) regressed on fiber volume ...Figure 33.10.1 33.10. 1: Types of muscle fibers: Smooth muscle cells do not have striations, while skeletal muscle cells do. Cardiac muscle cells have striations, but, unlike the multinucleate skeletal cells, they have only one nucleus. Cardiac muscle tissue also has intercalated discs, specialized regions running along the plasma membrane that ...These nuclei appear small and round when cut in cross section, very long (and often wiggly) in longitudinal section, and somewhere in between in oblique section. In cross-sectioned smooth muscle, only a fraction of the fibers display nuclei. Recall that each smooth muscle fiber is a single cell, each with its own nucleus. In each such cell, the ...Abstract. Abstract Adult skeletal muscle fiber is a symplast multinuclear structure developed in ontogenesis by the fusion of the myoblasts (muscle progenitor cells). The nuclei of a muscle fiber (myonuclei) are those located at the periphery of fiber in the space between myofibrils and sarcolemma. In theory, a mass change in skeletal muscle ...It compares three specific muscles in the human body that vary in muscle tissue type in terms of: Presence or absence of striations (5 points) Size, shape, and arrangement of fibers (5 points) Function/s resulting from the muscle contraction (5 points) Relationship of muscle cell properties to muscle function (10 points) The table is ...Muscle Tissues. There are three types of muscle in animal bodies: smooth, skeletal, and cardiac. They differ by the presence or absence of striations or bands, the number and location of nuclei, whether they are voluntarily or involuntarily controlled, and their location within the body.Smooth muscle fibers are spindle-shaped (wide in the middle and tapered at both ends, somewhat like a football) and have a single nucleus; they range from about 30 to 200 μm (thousands of times shorter than skeletal muscle fibers), and they produce their own connective tissue, endomysium.Although they do not have striations and sarcomeres, smooth muscle fibers do have actin and myosin ...Each skeletal muscle fiber is a skeletal muscle cell. These cells are incredibly large, with diameters of up to 100 µm and lengths of up to 30 cm. The plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma is the site of action potential conduction, which triggers muscle contraction.The nuclei are centrally situated like that of smooth muscle. Cardiac muscle sarcoplasm has a great amount of mitochondria to meet the energy demands. Similar to the skeletal muscle, cardiac muscle cells have an invaginating network of T-tubules and sarcoplasmic reticulum.To evaluate the effect of increasing the number of nuclei loaded onto the platform, we performed a separate experiment in which we isolated nuclei from two muscle samples, mixed them together, and then loaded either 20k or 40k nuclei (as quantified by a Countess II FL Automated Cell Counter) into a 10x well for snRNA-seq and for snATAC …Smooth Muscle (Vascular) Structure. Vascular smooth muscle cells have classically been envisaged as fusiform cells, on average 200 microns long × 5 microns in diameter, with a large central nucleus surrounded by an abundant array of endoplasmic reticulum and golgi apparatus, with the cytosol and plasma membrane tapering toward the poles.Find step-by-step Anatomy and physiology solutions and your answer to the following textbook question: Contrast smooth muscle to skeletal muscle, noting differences in cell shape, number and location of nuclei in each cell, the presence or absence of striations, innervation, the stimuli for contraction, and fatigue resistance.Learn how to write the entire formula for the chemical reaction in a smoke detector. Advertisement It is more a physical reaction than a chemical reaction. The americium in the smo...Cardiac muscle owes its striated appearance to the arrangement of thick and thin filaments that make up the contractile apparatus. Electron micrographs of cardiac muscle reveal a banding pattern of myofibrils similar to that observed for skeletal muscle. Like skeletal muscle, these bands are referred to as the A band, I band, and Z disk. The dark-staining A band is the region of the ...All muscles, even smooth muscle, works with actin and myosin, as well as a number of other cellular processes which rely on the motor proteins. Intercalated discs and branching are unique to cardiac muscle tissue. 2. An AED (Automated External Defibrillator) is a device used to restart a stopped heart. The AED pulses a strong jolt of ...- Cardiac myocytes are branched - Cardiac myocytes USUALLY have one nucleus, but will OCCASIONALLY have two nuclei, centrally located - Cardiac muscle has intercalated discs (interface between adjacent cells consisting of desmosomes and fascia adherens) - T tubules in cardiac muscle are larger and more numerous and occur at Z lines - Sarcoplasmic reticulum and terminal cisternae less well ...Each skeletal muscle fiber is a skeletal muscle cell. These cells are incredibly large, with diameters of up to 100 µm and lengths of up to 30 cm. The plasma membrane of a skeletal muscle fiber is called the sarcolemma. The sarcolemma is the site of action potential conduction, which triggers muscle contraction.It's a debate that science has yet to find a definitive answer to—but here's what to do if you get one. We sometimes get hard, painful, or tender lumps in our muscles. This is pret...Aug 28, 2021 ... Types of Muscles Comparison | Skeletal vs Cardiac ❤️ vs Smooth muscles | Anatomy & Physiology. Troponin, Tropomyosin, Transverse ...When cut in longitudinal section, smooth muscle nuclei appear very long and sometimes wiggly (due to contraction). In cross-sectioned smooth muscle, only a fraction of the fibers display nuclei. Recall that each smooth muscle fiber is a single cell, each with its own nucleus. In each such cell, the nucleus occupies only a small proportion of ...Growth in cell size is fundamental to normal development and function of organ systems and organisms, and this is especially true for skeletal muscle, where postnatal increases in muscle size and mass occur predominantly through longitudinal and radial enlargement of existing myofibers. Mirroring findings in rodents, average fiber (Types I and ...Study with Quizlet and memorize flashcards containing terms like Striations, cylindrical cells, and multiple nuclei are observed in ________. A. skeletal muscle only B. cardiac muscle only C. smooth muscle only D. skeletal and cardiac muscles, The cells of muscles, myocytes, develop from ________. A. myoblasts B. endoderm C. fibrocytes D. chondrocytes, Skeletal muscle is composed of very hard ...This is the nucleus of a cell in interphase (between cell divisions). A bluish purple line around the edge of the nucleus is the nuclear envelope/nuclear membrane. The small darkly staining granules are chromatin (chromosomes). The larger dark purple structure is the nucleolus. The nucleus of a cell in interphase.Skeletal muscle also has multiple nuclei present in a single cell. Smooth muscle tissue occurs in the walls of hollow organs such as the intestines, stomach, and urinary bladder, and around passages such as the respiratory tract and blood vessels. ... The primary variable determining force production is the number of myofibers within the muscle ... Figure 1. The body contains three types of muscle tissue: skeletal muscle, smooth muscle, and cardiac muscle, visualized here using light microscopy. Smooth muscle cells are short, tapered at each end, and have only one plump nucleus in each. Cardiac muscle cells are branched and striated, but short. The cytoplasm may branch, and they have one ...
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Parasympathetic nervous system anatomy The parasympathetic nervous system (PSNS) is a division of the autonomic nervous system (ANS) that controls the activity of the smooth and …Some of the main differences between striated and smooth muscles include the shape of cells, number of nuclei, presence of striations, location of the nucleus, fatigueness, action, attachment of muscles with bones, and examples of where they can be found in the body.The cerebellum is a vital component in the human brain as it plays a role in motor movement regulation and balance control. The cerebellum coordinates gait and maintains posture, controls muscle tone and voluntary muscle activity but is unable to initiate muscle contraction. Damage to this area in humans results in a loss in the ability to control fine movements, maintain posture, and motor ...Aggressive traders could probe the long side of SILK at current levels....SILK Silk Road Medical (SILK) was rated a new fundamental "buy" at sell-side firm B. Riley on Friday. The ... Cardiac muscle cells have many nuclei. Skeletal muscle cells are long and cylindrical with many nuclei. Cardiac muscle cells are found in the heart and large blood vessels. Smooth muscle cells have T tubules. The nuclei are centrally situated like that of smooth muscle. Cardiac muscle sarcoplasm has a great amount of mitochondria to meet the energy demands. Similar to the skeletal muscle, cardiac muscle cells have an invaginating network of T-tubules and sarcoplasmic reticulum. Name the number of nuclei and location of the nuclei in each type of muscle cell? Skeletal - many, peripheral Cardiac - one or two, central Smooth - one, central What type of muscle has highly organized SR which surrounds each myofibril? Surprisingly, the results revealed an inverse relationship between nuclei numbers and reserve capacity. We propose that as myonuclear numbers increase, the range of transcriptional return on a per nuclear basis in myofibers diminishes, which accounts for both the absolute reliance developing myofibers have on nuclear accrual to establish size ...Smooth Muscle. Smooth muscle is made up of cells that contain a single central nucleus. The cells stick together and are connected by specialised cell junctions, called gap junctions. The cells are spindle shaped, and the nucleus is central. This diagram shows a few of the cells that can be seen in the stained section below.There are three types of muscles: cardiac, skeletal, and smooth muscle. ... Unlike skeletal muscle, cardiac muscle fibers are branched cells with only 1-2 centrally located nuclei. Also unique to cardiac muscles are the ... In addition, cardiac muscle cells have a large number of myofibrils, which are specialized protein filaments that allow ...Cardiac muscle cells are ___ and thicker than skeletal muscle cells, and they have only ___ nuclei. shorter; 1-2. ... branched; 1-2. Smooth muscle is composed of short cells that have a ___ shape. fusiform. Cardiac muscle cells contain a large number of ___ to generate the ATP required for their unceasing work. mitochondria.Cardiac muscle is striated muscle that is present only in the heart. Cardiac muscle fibers have a single nucleus, are branched, and joined to one another by intercalated discs that contain gap junctions for depolarization between cells and desmosomes to hold the fibers together when the heart contracts. Contraction in each cardiac muscle fiber ...a. One nucleus. Smooth muscle fibers are characterized by . a. long, tapering, multinucleated cells. b. forming contractile tissue of walls of most hollow organs. c. possessing cross-striations. d. contracting in response to our conscious will. b. forming contractile tissue of walls of most hollow organs..
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