Fact 1: Constriction occurs when the muscular walls of blood vessels contract.

Fact 2: Cocaine also tightly squeezes, or constricts, the coronary arteries that feed blood to the heart.

Given the two facts above, answer the question "What occurs when the muscular walls of blood vessels contract?" with the following options: 
- Dehydration
 - rapid expansion
 - smooth skin
 - smoking tobacco
 - loose bumping
 - pinched nerves
 - tight sqeezing
 - movement


 

       tight sqeezing  