You are presented with the question "Constricting raises what" and the following answer choices: 
- 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.

Now knowing that constriction occurs when the muscular walls of blood vessels contract and systolic blood pressure is the force of blood on the blood vessel walls when the heart contracts, choose the best answer.


 

     systolic blood pressure    