There are five muscles worked when doing a triceps extension. The main muscle is, obviously, the triceps. Secondary muscles that are worked are the deltoid, pectorals major, latissimus dorsi, and teres major.
"Triceps" is singular. "Tricep" is not officially a word, although it it widely used.
The tricep is the muscle on the underside of the upper arm. The muscle on the upper side is the bicep.
The tricep muscle is mainly responsible for the straightening of the arm. This means that the tricep muscles are voluntary, and will only move if we wish to move our arms.
i believe its the triceps
A skeletal muscle.
tricep
trid claas
I think what your after is called an antagonistic pair of muscles, for example the bicep and the tricep. When the bicep is contracting the tricep relaxes and when the tricep is contracting the bicep relaxes.
There are two main ones, the tricep and the biscep. The tricep bicep is on the inside angle as defined by your elbow, the tricep is on the outside.
your tricep
Tricep.
bicep is the muscle on the front upper arm used to bend arm. Tricep is on the back of the upper arm, used to straighten arm, so, I guess they could be considered partners.