in coronary bypass surgery, a section of the vein is used to replace occluded coronary arteries. Over time, the vein wall becomes more like an arterial wall. Describe the change that would occur in the vein wall.
the tunica media would become thicker, containing more smooth muscle and elastic fibers
the smooth muscle fibers within the wall of an artery do not receive their nutrients from the blood within the lumen of the artery. why not?
arterial wall is too thick for nutrients from blood to diffuse to the smooth muscle fibers
blood flow within the capillaries is slower than within arterial or venous vessels. explain why this is important
blood flow must be slow to allow time for nutrients and wastes to diffuse across the capillary wall