BIO 202-assignment 3 – Flashcards
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What is the layer of the pleural membrane that is attached to the surface of the lung?
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visceral pleura
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What is the outermost layer of the pleural membrane?
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Parietal pleura
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What is the fluid filled area between the pleural layers called?
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Pleural cavity
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The pleural membranes function like a fluid filled balloon that completely surrounds the heart.
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false
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What determines the direction of gas movement?
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The partial pressure differences
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Which of the following statements about partial pressures of gases in the lungs is true?
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Po2 in the lungs > Po2 in the blood; Pco2 in the lungs < Pco2 in the blood
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Which of the following statements about partial pressures of gases in the tissues is true?
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Po2 in blood > Po2 in tissues; Pco2 in blood < Pco2 in tissues
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Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart.
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false
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Oxygen-poor blood is carried through systemic veins from the body tissues back to the heart.
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true
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Which of the following is true at the arterial ends of the pulmonary capillaries?
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The Po2 is lower in the capillaries than in the alveoli.
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Which of the following is true at the venous ends of the pulmonary capillaries?
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The Pco2 is equal in the capillaries and in the alveoli.
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At the arterial end of a tissue capillary, rank the following structures from highest to lowest Po2.
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Capillaries, tissue fluid, cells
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When partial pressures for a given gas are equal between the capillaries and the tissue fluids, no net movement of that gas occurs.
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true
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Gases diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure.
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true
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The partial pressure of a gas is measured in millimeters of mercury.
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true
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At the venous end of tissue capillaries, there is no net movement of O2 and CO2.
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true
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How can Boyle's law be represented?
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P1V1 = P2V2
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What does Boyle's law state?
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At a constant temperature, the pressure exerted by a gas varies inversely with the volume of that gas.
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Which of the following is an application of Boyle's Law?
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At a constant temperature, as the volume of a gas increases, the pressure decreases.
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As a volume of a gas increases, the number of molecules of that gas that collide with the walls of the container decreases.
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true
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As the lungs expand while breathing, the pressure in the lungs decreases.
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true
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Inspiration begins as __________.
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the diaphragm contracts
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What is the result of inspiration?
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An increased alveolar volume causes decreased alveolar pressure.
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Which of the following occurs during expiration?
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Decreased alveolar volume causes increased alveolar pressure.
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The alveoli never attain equal pressure with the ambient (outside) air.
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false
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If the volume of the alveoli increased, the pressure would decrease.
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true
