A&P Ch 20 HW
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Resistance in the blood vessels is primarily controlled by altering | vessel radius.
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| When carbon dioxide accumulates in a tissue, local arterioles will _________, increasing perfusion and decreasing carbon dioxide levels. | dilate
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| Capillaries have only a | tunica intima.
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| Under the microscope, the wall of a blood vessel is observed to contain only a tunica intima. This must be a(n) | capillary.
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| The vessels that are responsible for carrying blood away from the heart are | arteries.
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| In both pulmonary and systemic circulation, gas exchange occurs at the | capillaries.
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| During exercise, blood is shifted from the __________ into systemic circulation. | Veins
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| T/F : During exercise, resistance to flow in the viscera and organs decreases, causing an increase in blood flow to these areas. | False
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| T/F :During exercise, resistance to flow in skeletal muscles increases. | False
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| 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
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| T/F : Total cardiac output increases, but stroke volume always remains the same | False
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| T/F : Capillary exchange is the process by which cells receive everything they need to survive and to eliminate metabolic waste. | True
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| T/F : By far the most important means by which capillary exchange occurs is filtration | False
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| 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
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| T/F : Filtration pressure is the force responsible for moving fluid across capillary walls | True
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| Vasomotion of the renal arteries will control blood flow to the | kidneys
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| Blood pressure is highest in the ___________ and lowest in the _____________. | arteries closest to the heart; veins
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| 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.
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| Which vessel drains capillaries? | Postcapillary venules
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| When a person changes position from lying down to standing, the blood pressure in the veins of the lower limbs __________. | increases
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| 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.
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| Vasodilation | increases blood flow and decreases blood pressure.
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| Vasoconstriction | decreases blood flow and increases blood pressure.
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| T/F : Blood pressure is directly proportional to vessel resistance. | True
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| T/F : Blood flow is affected by both blood pressure and vessel resistance. | True
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| Deoxygenated blood from the heart myocardium drains into the right atrium via the | Coronary Sinus
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