Crash Course A&P: Muscles, Part 2

Table of Contents: Skeletal Muscles Work Together to Create and Reverse Movements 1:14 Motor Units 3:52 Three Phases of Muscle Twitches 4:41 Strength and Frequency of Impulses 5:29 Strength and Duration of a Contraction 5:29 Twitch Summation vs Tetanus 6:19 Isotonic vs Isometric Movements 8:50