It Contracts
It relaxes
Relaxes
contracts - for antagonistic muscle pairs e.g. muscles in arm (when one relaxes, other contracts, and vice versa)
When the bicep contracts, the tricep relaxes. These pair of muscles are known as antagonists which means as one contracts, the other relaxes and vice versa.
A muscle that contracts shortens whereas a muscle that relaxes lengthens.
The bicep muscle. The tricep contracts to straighten the arm as the bicep relaxes.
antagonistic muscle action.
the answer is when one muscle contracts the other relaxes
Basically, as one muscle contracts, the antagonist relaxes
The heart
Diaphragm