i am not sure but it might have something to do with your triceps and biceps
The biceps and the triceps.-McKenzie
Triceps :)
to move arm upwards, the biceps contracts. Triceps don't do any work here~
The triceps and biceps are antagonistic muscle groups; the triceps straighten the arm and the biceps pull it in the opposite way. Therefore, when the triceps contract, the biceps lengthen.
biceps are on your upper arm and triceps are below your biceps
The triceps contract when the biceps relax.And, vice versa. The triceps relax when the biceps contract.
The Triceps brachii
When your biceps contract (and your triceps relax), your arm bends at the elbow. When your triceps contract (and your biceps relax), your arm straightens. The biceps and triceps enable you to bend or extend your arm at the elbow.
yes
triceps and biceps are related (triceps for extemsion of the arm, biceps for flexion). Hamstrings are at a different place (in the leg). No relation
When you flex your arm your biceps contract, and your triceps extend. And when you unflex your arm the triceps contract and you biceps extend. The muscles work together to allow you to move your body.