Lecture 8

Lecture 8 - Lecture#8 Muscle and Bone I Muscle Physiology a...

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Lecture #8 Muscle and Bone I) Muscle Physiology a. Twitch is single stimulus of motor nerve brief contraction a.i. Increase stimulus recruit more axons (stimulated) a.ii. Note: motor unit: muscle fibers that are innervated by the same motor neuron ( one axon branches to the muscle) b. Tetanus: Maximal contraction caused by rapid repeated stimulation b.i. Tetanus strength > Maximum twitch because [Ca]I piles up between Ap’s higher level of [Ca]I greater contraction c. Cardiac muscle c.i. Little S.R.; most Ca comes from extracellular fluid c.ii. Long Ap’s with lots of V.g. Ca channel activator c.ii.1. lots of Ca influx c.iii. Stay open a long time, SUSTAIN Ca Influx Sustained contraction force blood out II) Vertebrate Bone a. Functions a.i. Provides Support and protection a.ii. Required for movement in vertebrates a.iii. Critical Calcium reservoir a.iii.1. Bones would waste away to get calcium b. Composition of Bone b.i. Gross Structure b.i.1. Head b.i.2. Shaft
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This note was uploaded on 01/17/2012 for the course HILD 100 taught by Professor Lee during the Spring '11 term at UCLA.

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Lecture 8 - Lecture#8 Muscle and Bone I Muscle Physiology a...

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