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

Fact 2: Constriction raises blood pressure.

Given the two facts above, answer the question "what happens when muscular walls of blood vessels contract?" with the following options: 
- matter vibrating
 - Dehydration
 - Leptospirosis
 - rapid expansion
 - at or near the margins
 - recovery time from fatigue
 - blood pressure rises
 - major threat to health


 

       blood pressure rises  