Contracting and Relaxing
What is muscle contraction
A muscle contraction happens when muscle fibers become shorter and generate force.
During contraction: Muscle fiber pulls together.
The muscle becomes shorter or develops tension.
Mucles move when Bones pull on them through tendons.
Energy is used.
Examples:
Bending our elbow.
Clenching our fist.
Jumping.
Chewing food.
What is Muscle Relaxation
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