KIN 2500 : Exam 3 Notes
15 Mar 2019
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Sliding filament theory: sarcomere contracts and changes the length, can shorten to about 50% of its length, sarcomeres shorten and z lines pull together, filaments do not shorten; just overlap. 4 steps at the bottom occur between 4 and 1. Sr and opens and releases calcium into the sarcoplasm: finds its way to troponin complex and attachment of thick filament to thin filament. Atrophy: decrease in diameter (immobilization can cause 3-4% loss per day in first week) Denervation atrophy: loss of nerve impulse to myo, permanent conversion to ct: miniature end plate potential, always receives a constant small innervation of impulses to the skeletal muscles. Cardiac myo: more abundant sarcoplasm, less defined sr and triads, gap junctions for rapid communication between cells, intercalated discs: thick sarcolemma, connects cells within a network. Lever system: e: effort or power behind the contraction, f: fulcrum or the point at which it pivots, l: load or resistance.
