BIO 211 Lecture Notes - Lecture 17: Skeletal Muscle, Motor Unit, Cardiac Muscle
1 Dec 2020
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One somatic motor neuron & all the skeletal muscle cells (fibers) it stimulates (10 cells to 2,000. Prolonged, sustained contractions for maintaining posture and running marathons. Split atp at very fast rate; used for walking and sprinting. Anaerobic movements for short duration; used for weight-lifting. cells). Total strength of a contraction depends on how many motor units are activated & how. One nerve cell supplies on average 150 muscle cells that all contract in unison. A twitch contraction is a brief contraction of all the muscle fibers in a motor unit in. Myogram record of a muscle contraction. Refractory period time when a muscle has temporarily lost excitability with skeletal muscles having a short refractory period and cardiac muscle having a long refractory period. large the motor units are. Control of muscle tension response to a single action potential. relaxation. Latent period: c2+ is being released from sr. Relaxation period: active transport of ca2+ into sr.
