Introduction to Muscles
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Introduction to Muscles
Muscle actions
Skeletal muscles attach to bones and create movement by contracting (shortening and pulling). They cannot push, so many movements use opposing muscles working as antagonistic pairs. At a joint, one muscle contracts while its partner relaxes; the roles can reverse to move the joint back.
- Triceps
- Biceps
- Quadriceps
- Gastrocnemius
- It relaxes as the biceps contracts
- It contracts at the same time to straighten the elbow
- It contracts to bend the knee
- It has no role in an opposing pair
Apply it to sport
A netball player accelerates, jumps to catch the ball, then lands and changes direction. Different muscle groups contribute to each movement.
- Quadriceps
- Hamstrings
- Gastrocnemius
- Deltoids
- Back of the thigh
- Shoulder
- Front of the thigh
- Calf
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