BIOL 1082 Lecture Notes - Lecture 29: Polysaccharide, Endoskeleton, Peristalsis
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How do animals move? (reading: concepts: 50. 5-50. 6 in textbook: explain the sliding filament mechanism of skeletal muscle contraction. Steps: a nerve impulse arrives at the neuromuscular junction, which causes a release of ach. The myosin (a think, contractile protein filament, with protrusions known as myosin heads) filaments can now attach to the actin, forming a cross-bridge. The breakdown of atp releases energy which enables the myosin to pull the actin filaments inwards, shortening the muscle. This occurs along the entire length of every myofibril (a cylindrical organelle running the length of the muscle fiber, containing actin and myosin filaments) in the muscle cell. The myosin detaches from the actin and the cross-bridge is broken when an atp molecule binds to the myosin head. This process of muscular contraction can last for as long as there is an adequate amount of atp and ca2+.
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