Muscles - Organismal Level

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. This video also explains twitch summation, tetanus, and isotonic vs. isometric movements. Discover more in Muscles - Muscle Cells which precedes this video.