II1 - 7. also contain intermediate filaments B. Difference...

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II. Cardiac Muscle A. General Features 1. involuntary muscle 2. one, centrally located nucleus 3. mitochondria larger and more numerous B. Structure of Tissue 1. muscle fibers branch and interconnect 2. intercalated disc - thickening of sarcolemma 3. cells connected by gap junctions a. allow passage of ions like Calcium b. makes adjacent cells electrically linked c. allows for rhythmic, domino-like contraction III. Smooth Muscle A. General Features 1. non-striated 2. 5-10 um in diameter; 30-200 um long 3. thick in middle; thinner, tapering off to the end 4. single oval centrally located nucleus 5. actin and myosin fibers not arranged as sarcomere 6. lack of organization (no bands) --> smooth muscle
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Unformatted text preview: 7. also contain intermediate filaments B. Difference in Contraction 1. intermediate filaments attach to dense bodies 2. as muscle cell contracts, twists like corkscrew 3. caveolae- like T tubules of skeletal muscle C. Two Kinds of Smooth Muscle 1. visceral (single unit) muscle a. small arteries and veins b. viscera - stomach, intestines, uterus, bladder c. continuous network with gap junctions d. action spreads from one cell to another 2. multiunit muscle a. each fiber (cell) has it own nerve ending b. no gap junctions c. large arteries, large airways, arrector pili...
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This note was uploaded on 01/29/2012 for the course SCIE SYG2000 taught by Professor Bernhardt during the Fall '10 term at Broward College.

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II1 - 7. also contain intermediate filaments B. Difference...

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