21_ActiveLecturePRS - Which of the following is a unique...

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Which of the following is a unique characteristic of arteries, when compared to veins? 1. Arteries contain tunica interna, tunica media, and tunica externa. 2. Arteries have a thinner tunica media. 3. Arteries contain an internal elastic membrane in their tunica interna. 4. Arteries collapse when blood is not flowing through them.
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Which of the following is an important characteristic of capillaries? 1. Blood flows through them quickly and exchange occurs slowly. 2. Blood flows through them slowly and exchange occurs quickly. 3. They expand and recoil with elastic rebound. 4. None of these is correct.
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Where are fenestrated capillaries important? Why? 1. In filtration areas of the kidneys/they allow rapid exchange of water and solutes between plasma and interstitial fluid. 2. In the blood-brain barrier/they have restricted permeability. 3. In almost all areas of the body/they allow diffusion of very small molecules and water. 4. All of the above are correct.
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Why are valves located in veins, but not in arteries? 1. Because venous blood pressure is lower 2. Because valves prevent backflow of blood 3. Because venous walls are more muscular 4. 1 and 2 are correct
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Georgia stands all day at her job, from what condition may she begin to suffer? 1. An aneurysm 2. Varicose veins 3. Atherosclerosis 4. High blood pressure
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The heart and arteries of the systemic and pulmonary circuits contain ___% of blood volume and the venous system contains ____%. Why? 1. 50:50/Blood must be evenly distributed. 2. 65:35/High capacitation of arteries. 3. 35:65/Low capacitation of veins. 4. All of these may be correct, depending on whether the individual is sedentary or exercising.
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Why is blood pressure higher in the aorta than in the inferior vena cava? 1.
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This note was uploaded on 09/13/2011 for the course BIOL 2401 taught by Professor Rameriz during the Spring '11 term at University of Texas at Dallas, Richardson.

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21_ActiveLecturePRS - Which of the following is a unique...

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