What is muscle contraction?

Question

anonymous · Answer

A muscle contraction occurs when a muscle moves, ie., lengthens and/or shortens.  I think, however, you are asking about a muscle contracture, which is a permanent shortening of the muscle which can be caused by prolonged immobility.

anonymous · Answer

if you are talking say 

example

if you are flexing you biceps   

the part that pulls is the one under where you elbow is
the part that relaxes is the place above the elbow

    IIII      ^     when arm goes up ( relaxes )       
    IIII       |                  |                                                           
    IIII_________            |
    ____________/         |
     ^                           |
     |                            |
     |__________________|        bottom part pulls