Question

Of the following variables investigated during the lab, which is the best (quickest) method for the body to alter/regulate blood flow?

use deep breathing

change blood vessel length

change viscosity

change blood vessel radius

Answer 1

Answer: change blood vessels radius

Rationale: Our human body will act accordingly to our body function. So some times our body will increases the blood flow some times it will make the blood flow decreased. It according to what happening in the body.

These are achieved by the vasoconstriction and vasodilation. It is the bast way that the body will use to change the blood flow by changing in the size (blood vessels).

Radius - Here refers to the diameter of the blood vessels. When it get dilated or wider, then it is considered as vasodilation.

Narrowed or get shortened in diameter then the normal size will be considered as the vasoconstriction of the blood vessels.