Constriction occurs when the muscular walls of blood vessels contract.
Cocaine also tightly squeezes, or constricts, the coronary arteries that feed blood to the heart.
Tight squeezing ccurs when the muscular walls of blood vessels contract.
What occurs when the muscular walls of blood vessels contract?

Dehydration
rapid expansion
smooth skin
smoking tobacco
loose bumping
pinched nerves
tight sqeezing
movement