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A&P Ch 20 HW

QuestionAnswer
Resistance in the blood vessels is primarily controlled by altering vessel radius.
When carbon dioxide accumulates in a tissue, local arterioles will _________, increasing perfusion and decreasing carbon dioxide levels. dilate
Capillaries have only a tunica intima.
Under the microscope, the wall of a blood vessel is observed to contain only a tunica intima. This must be a(n) capillary.
The vessels that are responsible for carrying blood away from the heart are arteries.
In both pulmonary and systemic circulation, gas exchange occurs at the capillaries.
During exercise, blood is shifted from the __________ into systemic circulation. Veins
T/F : During exercise, resistance to flow in the viscera and organs decreases, causing an increase in blood flow to these areas. False
T/F :During exercise, resistance to flow in skeletal muscles increases. False
T/F : The changes in resistance to flow in the viscera and organs help cause an increase in blood flow to the skeletal muscles. True
T/F : Total cardiac output increases, but stroke volume always remains the same False
T/F : Capillary exchange is the process by which cells receive everything they need to survive and to eliminate metabolic waste. True
T/F : By far the most important means by which capillary exchange occurs is filtration False
T/F : A small amount of fluid moves out of capillaries at their venous ends, and most of that fluid reenters the capillaries at their arterial ends. False
T/F : Filtration pressure is the force responsible for moving fluid across capillary walls True
Vasomotion of the renal arteries will control blood flow to the kidneys
Blood pressure is highest in the ___________ and lowest in the _____________. arteries closest to the heart; veins
Under the microscope, a blood vessel is observed to have a relatively thin wall, a large lumen, is collapsed, and contains a thick tunica externa. This is probably a(n) vein.
Which vessel drains capillaries? Postcapillary venules
When a person changes position from lying down to standing, the blood pressure in the veins of the lower limbs __________. increases
In a working tissue like skeletal muscle, carbon dioxide may accumulate along with an increase in lactic acid. In this example, carbon dioxide and lactic acid will act as vasodilators.
Vasodilation increases blood flow and decreases blood pressure.
Vasoconstriction decreases blood flow and increases blood pressure.
T/F : Blood pressure is directly proportional to vessel resistance. True
T/F : Blood flow is affected by both blood pressure and vessel resistance. True
Deoxygenated blood from the heart myocardium drains into the right atrium via the Coronary Sinus
Created by: elizabethcosio