The muscles are moving antagonistically.
Move the forearm at the elbow
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.
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.
Both the tricep and the bicep are muscles which control rotational movement at the elbow. The bicep contracts when the forearm is flexed, and the tricep contracts when the forearm is extended.
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The bicep on the front and the tricep on the back.
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 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
I think it might be a bicep and a tricep
The muscles in the top of your arms are the bicep, tricep and deltiod.
2; The Bicep and the Tricep
The Bicep muscle (one on top) is contracting The Tricep muscle (one below) if relaxing The Bicep and Tricep muscles are antagonistic- they work as opposites, so when one contracts, the other relaxes.