BISC 1112 Lecture Notes - Lecture 11: Glycolysis, Endoskeleton, Long-Distance Running
28 Feb 2017
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Document Summary
One bundle of muscles has a tube filled with muscle fibers. Each muscle fiber has nuclei on the surface of the plasma membrane that surrounds the myofibril that are in segments of sarcomeres. When fully contracted the two sides cross over but the size is the same, just the length shortens with crossover. Myosin has heads that will be able to attach to actin with a power stroke. Do not otherwise interact when blocked by tropomyosin and troponin complex hold and block actin. Ca2+ bind with troponin to inhibit the blockage. It causes action potential to trigger calcium release. The calcium comes from depolarization stored within the. Hydrolyzing the atp - removal of a phosphate. Add the phosphate back low energy configuration. The filament moves toward center of sarcomere. One motor unit attaches to muscle fibers. Muscle burning is due to buildup of lactic acid.
