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Which muscle? The biceps, at the front of the arm, get shorter, and the triceps, at the back, get longer.
The Biceps brachii muscle. We just call it the biceps, though. (Pronounced bye-seps) To straighten the arm again, the triceps muscle is contracted - which lies 'underneath' the upper arm.
No, the biceps is a muscle in your arm.
Biceps Brachii
When you bend your arm at the elbow and feel your biceps your upper arm muscle contracts.👏👏
when you bend your arm
Biceps brachii muscle, is a muscle located on the inside of the upper arm Biceps femoris muscle, is one of the hamstring muscles at the back of each thigh
The Triceps extend (Stretch out) as the biceps contract.
Probably the Biceps Brachii (commonly called Biceps).
Biceps or triceps
The biceps muscle is located in the front area of the upper arm. The biceps muscle helps to stabilize the large bone in the upper arm (the humerus) in the shoulder socket. It also helps to accelerate and decelerate the arm during overhead activities, like tennis or pitching. The biceps tendons keep the biceps muscle attached to the shoulder at one end and the elbow at the other end. Tendons are strong cord-like structures that connect each end of the biceps muscle to bones. At one end of the biceps muscle, tendons connect the biceps to the shoulder in two places. At the other end of the muscle, tendons connect the biceps muscle to the smaller bone (radius) in the lower arm. Source:AAOS
Probably the Biceps Brachii (commonly called Biceps).