The biceps and triceps. When the biceps contract, the triceps relax. If you can flex it, there's an opposite action happening somewhere.
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 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
Antagonist muscles are muscles that counteract the action of agonist muscles.Some examples of antagonist muscles are:Triceps work opposite of biceps.Hamstrings works opposite of quadriceps.The sternocleidomastoid works opposite of the deltoids.
Your Triceps would be as its the opposite muscle to your Biceps
Biceps Branchi
i am not sure but it might have something to do with your triceps and biceps
They are the opposite muscle to the biceps. If you bend your arm to make the muscle on the top (the biceps) bulge, the muscle on the bottom (the triceps) relaxes. The triceps is on the back of your arm, and is used to straighten the elbow.
The effector muscle is the biceps brachii.
The biceps and the triceps.-McKenzie
A biceps is any muscle with two heads.
Most muscles in the body have "counterparts", one pulls and your leg curls up, the other pulls and the leg straightens. They would be on opposite sides of your leg. The "biceps" are the upper arm top muscle, and the tri-ceps (I think) is the upper arm bottom muscle. They work in conjunction to let you 'curl a barbell'' or do a chin-up.