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Each time you take a step, 200 muscles work in unison to lift your foot, propel it forward, and set it down. It’s just one of the many thousands of tasks performed by the muscular system: this network of over 650 muscles covers the body and is the reason we can blink, smile, run, jump, and stand upright. So how does it work? Emma Bryce takes you into the body to find out.

Lesson by Emma Bryce, directed by Viviane Leezer.

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Tony Trapuzzano, Devin Harris, Brandy Jones, John Ess, Jessica James, Barun Padhy, Dale Dualan, Simone Kidner, Shawn Quichocho, Gi Nam Lee, Joy Love Om, Narat Suchartsunthorn, Miloš Stevanović, Ghassan Alhazzaa, Duo Xu, Yankai Liu, Pavel Zalevskiy, André Spencer, Justus Berberich, Claudia Mayfield.
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Big Guns: The Muscular System - CrashCourse Biology #31

Hank tells us the story of the complicated chemical dance that allows our skeletal muscles to contract and relax.

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Table of Contents
1) Cardiac, Smooth, & Skeletal Muscles 01:09
2) Muscle Anatomy 02:03
a) Muscle Fibers 03:07
b) Myofibrils 04:15:1
c) Sarcomeres 04:19:1
d) Myofilaments 04:37:2
3) Biolography 05:37:1
4) Sliding Filament Model 07:47

References for this episode can be found in the Google document here: http://dft.ba/-3syE

crash course, crashcourse, biology, muscular system, muscle, cellular respiration, energy, ATP, human body, chemistry, cardiac muscle, smooth muscle, skeletal muscle, contract, relax, tendon, anatomy, physiology, fascicle, fibers, protein, myofibril, sarcomere, myofilament, actin, myosin, sliding filament model, biolography, electron microscope, tropomyosin, troponin, sarcoplasmic reticulum, motor neuron Support CrashCourse on Subbable: http://subbable.com/crashcourse