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Chapter 47 Motor Function

Chapter 47 Motor Function - Slow-twitch Fibers Fast-twitch...

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Miguel Alvarez LS2 AAP Tutor Winter 09: Week 8 Session 2 Chapter 47: Motor Function (Effectors) I. Sarcomere II. At the Neuro-Muscular Junction a. Ach opens Na channels, and action potential travels into muscle fiber via T tubules. b. T tubules go into the sarcoplasm (muscle cell cytoplasm) and close to sarcoplasmic reticulum (SR). c. Since [Ca2+] is high inside SR, the action potential will trigger the release of Ca2+. d. Ca2+ then binds to actin (more specifically: troponin). III. Sliding Filament Theory
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Unformatted text preview: Slow-twitch Fibers Fast-twitch Fibers Myoglobin: yes (oxygen binding) Mitochondria: many Blood vessel supply: well-supplied Fatigue easily: no Max tension developed slowly Use: long distance running, swimming, etc. Myoglobin: little or none Mitochondria: few Blood vessel supply: poorly-supplied Fatigue easily: yes Max tension developed quickly Use: sprinting, weight lifting, etc. Miguel Alvarez LS2 AAP Tutor Winter 09: Week 8 Session 2...
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