Extraordinary Human Muscles

We have looked at photos of body builders.  We have watched strong men competitions.  These are both examples of when the muscle are working in peak performance.  This is not always the case.  Sometimes the muscles do not work like they should.   Watch the video for examples of when muscle don't work.  The first patient has muscles that contract all the time and the second patient has muscle that don't contract at all.  Take notes using the quiz questions.  

Extraordinary Human Muscles