muscle tissue

muscle tissue — specialized for contraction, produces movement muscle cells have organelles and properties distinct from those of other cells
Skeletal Muscle Tissue — organ of muscular system contains large muscle cells (1ft) individual muscle cells called muscle fibers — bc they are long and slender each muscle fiber has 100s of nuclei inside plasma membrane — the fibers are described as multinucleate muscle fibers here, incapable of dividing new fibers produced via division of myosatellite cells — stem cells in adult skeletal tissue — capable of repairing itself after injury do not usually contact unless stimulated by nerves nervous system provides voluntary control over skeletal muscle activities — skeletal muscle called striated voluntary muscle muscle fibers tied together by collagen and elastic fibers
Cardiac Muscle Tissue found in heart cardiocyte — heart cell, smaller than skeletal muscle cell, has one nucleus but some have 5 straight striations bc of the myosin and actin filaments cardiac muscle tissues consists of branching network of interconnected cardiac muscle cells — cells are connected as regions called intercalated discs membranes locked together by desmosomes, proteoglycans (lock cells together), gap junctions (help ion movement that helps to synchronize muscle contractions) limited ability to repair itself — incomplete repairs — heart function lost pacemaker cells set regular heart rate cardiac muscle called striated involuntary muscle bc there is no voluntary control over cells
Smooth muscle tissue found in walls of blood vessels, around hollow organs like urinary bladder, and in layers around respiratory, cardiovascular, digestive, reproductive tracts smooth muscle cells small, spindle-shaped, w/ tapering edges and single, oval nucleus cells can divide — regenerate after injury actin and myosin filaments arranged differently — no striations contract on their own, gap junctions coordinate cell movement some cell contractions can be controlled by nervous system smooth muscles known as nonstriated involuntary muscle

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	Created by Jeannene Rumball over 8 years ago