instant movement
A spasm.sedimentarySpasm
A painful and involuntary muscular contraction.
A painful muscle contraction is a cramp.
A painful contraction of a muscle is a cramp or charley horse.
Due to the forming of guided flow streams resembling those of venturi, the irreversibilities from a sudden contraction are less than those from a sudden expansion. That's why head losses due to sudden expansion are more than sudden contraction.
Angiospasm is sudden contraction of a blood vessel. In contrast, vasoconstriction is the normal process of contraction of a blood vessel.VasoconstrictionAngiospasm
a cramp or spasm.
A cramp is a sudden over-shortening of a muscle. Cramps are involuntary and, often, severe. They can be extremely painful.
It is called a Tracheospasm
Often it is called a cramp.
Such a painful muscle contraction is commonly known as cramp.