The difference in pressure from one end of a vessel to the other is called ________, which greatly determines the rate of flow.
Choose the correct description of a typical medium-sized vein.
A)In these vessels, the thin tunica media is surrounded by a thick tunica externa composed of mostly collagen fibers.
B)Ranging from 2 mm to 9 mm in diameter, its thin tunica media consists of one to two layers of smooth muscle cells.
C)It has a diameter of approximately 0.4 cm and has more smooth muscle cells and fewer elastic fibers.
D)It ranges from 2 mm to 9 mm in diameter, and the relatively thick tunica externa has longitudinal bundles of elastic and collagen fibers.
E)It has a diameter up to 2.5 cm, and its tunica media is dominated by elastic fibers rather than smooth muscle cells.
Water and solutes that are not reabsorbed by capillaries ultimately return to the bloodstream by way of
The difference between the systolic and diastolic pressures is the