West Coast University PATHO 370 c15.

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Chapter 15: Alterations in Blood Flow Test Bank MULTIPLE CHOICE 1. Which vessel normally demonstrates the most rapid blood flow? a. An arteriole b. A capillary c. A venule d. The vena cava ANS... : D The vena cava has the most rapid rate of flow. Arterioles don’t offer the most rapid blood flow. Capillaries are composed of a single thickness of endothelial cells attached to a protein network called the basement membrane and don’t offer the most rapid blood flow. A venule begins where the arteriole ends and doesn’t offer the most rapid blood flow. REF: Pg. 316 2. The movement of blood through the vascular system is opposed by the force of a. viscosity. b. the vessel length. c. the vessel radius. d. resistance. ANS: D The movement of blood through the vascular system is opposed by the force of resistance. Three determinants of resistance are vessel length, vessel radius, and blood viscosity. Viscosity is the thickness of fluid and has an effect on resistance. The length of the vessel does have an effect on the resistance. Vessel radius has an effect on resistance. REF: Pg. 314 3. Which causes vasoconstriction? a. Norepinephrine b. Calcium channel blocker c. -Adrenergic antagonist d. Acetylcholine ANS: A The release of norepinephrine results in arterial vasoconstriction via receptors located on the vascular smooth muscle walls. Calcium channel blockers produce vasodilation by interfering with calcium intake into the vascular smooth muscle cells. -Adrenergic antagonists do not cause vasoconstriction. Acetylcholine does not have an effect on vasoconstriction. REF: Pg. 318 [Show More]

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