The triceps are the large muscles on the back of upper arms.
behind your bicep, or on the backside of the upper part of the arm
the tricep muscle is on the bottom or back side of your body
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.
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.
Muscles can only pull not push. That is why they work in pairs an example is your tricep and bicep, your bicep pulls your arm up and your tricep pulls your arm down.
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Tricep brachii is responsible for extension (straightening) of the arm at the elbow. There are 3 heads of the Tricep; the long, lateral and medial heads. The Tricep is an antagonist of the bicep and brachialis muscles of the upper arm, which both assist in flexion at the elbow joint.
The muscles are moving antagonistically.
The bicep on the front and the tricep on the back.
Your arm uses its bicep and tricep muscle to move. Muscles can only contract so they have to work in pairs. Ex. Bicep and tricep One muscle contract, the other relaxes