Term
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Definition
1. Sarcolemma: plasma membrane
2. T-tubules: extension of plasma membrane to allow depolarization to take place within the cell
3. Sarcoplasmic Reticulum: specialized ER |
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Term
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Definition
a. Surrounded by connective tissue; acts as a shrink wrap
b. Contains nerve and blood vessels.
c. Consists of bundles of muscle fibers |
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Term
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Definition
a. Same as muscle cells
b. Consists of myofibrils |
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Term
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Definition
| a. Contains sarcomeres: the functional unit of skeletal muscle cells, consists of thick and thin filaments |
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Term
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Definition
1. Contains sarcomeres
2. Structure of sarcomeres
a.Z-lines: create boundaries between sarcomeres; end points
b. Thin filaments: protrudes from z-lines, composed of actin and two regulatory proteins: troponin (binding site for Ca2+) and tropomyosin (covers actin in a resting state)
c. Thick filaments: composed of myosin
i. Myosin have two “heads”: one binds to actin (actin binding site) and one binds to ATP (ATP binding site)
d. Elastic Fibers: help align actin and myosin
i. Nebulin: helps keep actin aligned within the sarcomere
ii. Titin: provides elasticity and stabilizes myosin |
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