Z331 Fall 2010 Ecampus Week 6 Lecture 2 Tension Production & Control Posted

Z331 Fall 2010 Ecampus Week 6 Lecture 2 Tension Production & Control Posted

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Unformatted text preview: Week 6: Lecture 2: Chapter 10 Muscular Tissue: Tension Production & Control Tension Production The allornone principal: as a whole, a muscle fiber is either contracted or relaxed Tension of a Single Muscle Fiber depends on: the number of pivoting cross-bridges the fibers resting length at the time of stimulation the frequency of stimulation Tension and Sarcomere Length Figure 1014 LengthTension Relationship Number of pivoting cross-bridges depends on: amount of overlap between thick and thin fibers Optimum overlap produces greatest amount of tension: too much or too little reduces efficiency Normal resting sarcomere length is 75% to 130% of optimal length Normal resting sarcomere length is 75% to 130% of optimal length A single neural stimulation produces: a single contraction or twitch which lasts about 7 100 msec Sustained muscular contractions: require many repeated stimuli Myogram Twitch tension development Figure 1015b (Navigator) 1. Latent period before contraction: the action potential moves through sarcolemma causing Ca 2+ release 2. Contraction phase: - calcium ions bind...
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This note was uploaded on 02/15/2011 for the course ZOOLOGY 331 taught by Professor Amyharwell during the Fall '10 term at Oregon State.

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Z331 Fall 2010 Ecampus Week 6 Lecture 2 Tension Production & Control Posted

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