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

Fact 2: Systolic blood pressure is the force of blood on the blood vessel walls when the heart contracts.

Given the two facts above, answer the question "Constricting raises what" with the following options: 
- mass and density
 - the looseness of soil
 - retaining heat
 - direct damage to the lungs
 - systolic blood pressure
 - major threat to health
 - metabolic reaction
 - Veins and arteries.


 

     systolic blood pressure    