A painful contraction of a muscle is a cramp or charley horse.
A painful muscle contraction is a cramp.
contraction
The noun for muscle shortening is called contraction.
Painful
How about " contraction" ? Or you could have hemoglobin reactional dispersal of sperm
Hurt
Isotonic contractions are the type that involve muscle movement. This movement is due to a change in length as the muscle fibers shorten or lengthen.
Weren't is the contraction word for were not.
muscle
very painful Agony
contraction for the word he is: he's
contraction for the word who is: who's