Hi its all because of how your gripping the ball if you look at your wrist when ready to pitch you will see a muscle come out and that is what causes all the pressure but do not grip lightly or else you may have a very bad pitch and slow pitch , Julian
When you bend your arm at the elbow and feel your biceps your upper arm muscle contracts.👏👏
Inn other words muscle flexing can be called muscle shortening and extension when muscle is elongating. For example when you bend you arm towards your shoulder your bicep muscle is shortening and you can feel a bump. When you extend your arm you can feel that the bump is stretching out and disappearing, that is muscle extension.
A muscle spasm that occurs in response to pressure on the upper arm
There is not a single muscle that rotates the upper arm. The name of the muscle that contributes in rotation of the upper arm is deltoid muscle.
The two main muscles of the arm are known as the bicep and triceps. When the lower arm is raised from resting position, the bicep contracts and feel hard.
the function of a muscle cell is, by definition, to move. this an be accomplished when the cell contracts. contracting makes it denser, which is why when you feel a relaxed muscle in your arm suddenly tense up, it hardens.
Skeletal muscle is associated with the upper arm.
The brachialis is a muscle in the upper arm that flexes the elbow joint.
one of the brachial nerves or maybe a stroke
What are the tendon in your arm?
no
Biceps or triceps