Chapter 11 Part 2 notes

Chapter 11 Part 2 notes - Chapter 11 Part 2 Terms...

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Chapter 11 Part 2 Terms Acetylcholine Acetylcholinesterase Excitation of Muscle Fiber steps #1- 5 Excitation - contraction coupling steps #6-9 Contraction steps# 10-13 Relaxation steps # 14-18 Rigor Mortis Stiffening of body beginning 3 to 4 hours after death—peaks at ___ hours after death and diminishes over the next 48 to 60 hours * activates ________________ cross bridging and muscle contracts, muscle relaxation requires ____________ and is no longer produced after death * Length tension relationship Amount of tension generated depends on length of muscle before it was stimulated 1) overly contracted = 2) too stretched= 3) optimal resting length Muscle Twitch Threshold- minimum voltage necessary to produce action potential Phases of twitch contraction 1) latent period- 2 msec delay 2) contraction phase 3) relaxation phase A single twitch contraction is not strong enough to do any useful work.
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Recruitment and stimulus intensity Stimulated the whole nerve with _______ and __________ voltage produces _________ contractions More motor units are being recruited Called: Production of variable contraction strengths Stimulating the whole nerve with higher voltage gets stronger contractions because recruit more motor units
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Chapter 11 Part 2 notes - Chapter 11 Part 2 Terms...

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