M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

Light-headedness is a common feeling in older individuals who rise too quickly off their seat. This is due to a decreased ability to vasoconstrict - when the individual stands up, blood from the head flows down under the added force of gravity. This depletion of blood from the brain can result in the light-headed sensation. This pressure drop is most apparent in vessels of high pressure. Which of the following would this phenomenon least effect?

A

Arteries off the aorta

B

Venules

C

Capillaries

D

Arterioles