KAAP430 Study Guide - Midterm Guide: Myosin Head, Oxidative Phosphorylation, Acetyl-Coa
21 Mar 2017
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Found in walls of blood vessels & internal viscera. Controlled involuntarily (not under direct conscious control). Found attached to the skeleton produces motion. Runs over entire length of muscle fiber. Transverse (t) tubules extensions of the plasmalemme that pass laterally through a muscle fiber from interior exterior: transmits nerve impulses from plasmalemma myofibrils. Sarcoplasmic reticulum (sr) longitudinal network of tubules that store ca2+ for muscle contraction. Contain heads that are covered by tropomyosin. Ca2+ + troponin tropomyosin moves away & myosin heads connect to actin cross-bridges for contraction. Myofilament that runs all the way through the sarcomere. Anchors myosinheads to the center of the sarcomere. Extensible portion stretches like a spring . Ca2+ + troponin tropomyosin moves away & actin connects to myosin heads cross-bridges for contraction. Alpha-motor neuron nerve cell that connects with & innervates many muscle fibers. Motor unit single alpha-motor neuron & all of the fibers it innervates. More operating motor units increased contractile force.
