Foreskin contraction, called phimosis
The camel itself is a foreskin.
It is called concentric isotonic contraction.
An involuntary muscle contraction is called a spasm.
This is due to contraction of the biceps, and is known as flexion.
A vasectomy, is internal cutting for birth control. Cutting the exterior (foreskin), is called circumcision.
The spongy stuff is called a foreskin.
The contraction of the heart chambers in a regular cycle is called systole
Contraction of the ventricles and atria is called systole. Relaxation is called diastole.
constant contraction of a muscle is called the muscle tone
A rhythmic muscular contraction in the body is called Peristalsis.
Vasoconstriction
This is called the systole :)