Constriction occurs when the muscular walls of blood vessels contract, and cocaine constricts the blood vessels. Given these facts, cocaine causes what to contract among the following options:
- layers of fat
 - a lot of human deaths
 - Walls of blood vessels.
 - harmful substances
 - the rest of the body
 - metabolic reaction
 - direct damage to the lungs
 - decreases its bodily water


 

   Walls of blood vessels.      