Arterioles receive blood from arteries, which are vessels with a much larger lumen. as their own lumen averages just 30 micrometers or less, arterioles are critical in slowing down—or resisting—blood flow. the arterioles can also constrict or dilate, which varies their what?

Know MoreArterioles receive blood from arteries, which are vessels with a much larger lumen. as their own lumen averages just 30 micrometers or less, arterioles are critical in slowing down—or resisting—blood flow. the arterioles can also constrict or dilate, which varies their what?