Muscles Part 2 Organismal Level Crash Course Anatomy amp Physiology 22

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=I80Xx7pA9hQ

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 episode also explains twitch summation, tetanus, and isotonic vs. isometric movements. • Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App! • Download it here for Apple Devices: https://apple.co/3d4eyZo • Download it here for Android Devices: https://bit.ly/2SrDulJ • Chapters: • Introduction: Heavy Lifting 00:00 • How Muscles Push Pull 1:13 • Functional Muscle Groups: Prime Movers, Antagonists, and Synergists 2:27 • Motor Units 3:49 • 3 Phases of Muscle Twitches: Latent, Contraction, Relaxation 4:41 • Graded Muscle Responses 5:22 • Temporal Summation vs Tetanus 6:19 • Multiple Motor Unit Summation (Recruitment) 7:07 • The Size Principle of Recruitment 7:52 • Isotonic vs Isometric Movements 8:50 • Review 9:28 • Credits 9:59 • • *** • Crash Course is now on Patreon! You can support us directly by signing up at / crashcourse • Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: • Mark Brouwer, Jan Schmid, Steve Marshall, Anna-Ester Volozh, Sandra Aft, Brad Wardell, Christian Ludvigsen, Robert Kunz, Jason, A Saslow, Jacob Ash, Jeffrey Thompson, Jessica Simmons, James Craver, Simun Niclasen, SR Foxley, Roger C. Rocha, Nevin, Spoljaric, Eric Knight, Elliot Beter, Jessica Wode • **SUBBABLE MESSAGES** • TO: Ariela • FROM: Gavi • I love you so much, stay awesome as always! • -- • TO: Josiah P. • FROM: Amy P. • I love you! • **SUPPORTER THANK YOU!** • Thank you so much to all of our awesome supporters for their contributions to help make Crash Course possible and freely available for everyone forever: • Vanessa Benavent, Les Brown, John Hadfield, Damian Shaw, Burt G. Clothier Tad A. Saine, Ashley Williamson, Carrie Williamson, Melissa A, Lopin Forsythe, Trevor Sacks • -- • Want to find Crash Course elsewhere on the internet? • Facebook - / youtubecrashcourse • Twitter - / thecrashcourse • Tumblr - / thecrashcourse • Support Crash Course on Patreon: / crashcourse • CC Kids: / crashcoursekids

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