[BIOS 1030] - Final Exam Guide - Ultimate 24 pages long Study Guide!
28 Nov 2016
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Muscle function: produce movement or generate tension. Fasicles (bundles; ct covering on each one) Bundles of muscle fibers wrapped with connective tissue (fascia) The point of attachment of muscle to the stationary bone is the orgin. Sarcomere: one contractile unit within a single myofibril (contractile unit) Z lines: attachment points for sarcomeres (where myosin and actin are attached) Arrangement of filaments gives rise to striated appearance of skeletal muscle. Nerve activation of individual muscle: acetylcholine released from motor neuron at neuromuscular junction, electrical impulse transmitted along t tubules, calcium released from sarcoplasmic reticulum. Contraction: formation of cross-bridges between thin and thick filaments. Calcium is always pumped back into sarcoplasmic reticulum (as long as atp is available) Atp is replenished by a variety of means. Aerobic metabolism of glucose, fatty acids, and other high-energy molecules. Motor neuron and all the muscle cells it controls. Activation of additional motor units increases tension produced by a contracting muscle.
