Antagonistic Muscle Pairs
1. All muscles are arranged into antagonistic pairs working in opposition to each other, alternately contracting and relaxing to make motion possible.
2. Muscles within each pair are made up of specialized cells that can change length or shape by contracting and relaxing.
3. When one muscle of a pair contracts, the other relaxes.
Antagonistic refers to working in opposition to each other.
Example: The triceps and biceps work as a pair to make movement of the arm possible.