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10:41
YouTube
CrashCourse
Muscles, Part 2 - Organismal Level: Crash Course Anatomy & Physiology #22
Hank calls in a friend to do his push-ups for him today to explain how skeletal muscles work together to create and reverse movements. Hank and Claire also demonstrate the role size plays in motor units, the three-phase cycle of muscle twitches, and how the strength and frequency of an impulse affect the strength and duration of a contraction ...
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