KNES 259 Lecture Notes - Lecture 35: Motor Unit, Glycogen, Phosphofructokinase
6 Dec 2016
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Document Summary
Shortening of the sarcomere creates enough tension in the tendon to move the load, allowing for visible shortening. Sarcomere shortening does not create enough tension in the tendon to move the load so there is no visible shortening. Isometric contraction first builds tension in the tendon. A greater load requires more tension and, as a result, more isometric contraction. Isotonic shortening then maintains a constant tension while actually moving the load. Latent period: time between the ap and the visible shortening of the contraction (includes excitation-contraction coupling and isometric contraction) A greater load has a longer latent period due to increased tension requirement. Back slippage: myosin heads slipping backwards on actin filaments if not enough are. Shorter contraction distance attached to the actin to maintain it"s position. Sometimes the isometric contraction is not enough to overcome the load (can"t put enough tension in the tendon) so only isometric contraction occurs, no isotonic contraction.
