BIO 202-Assignment 3 Questions With 100% Verified ANSWERs

BIO 202-Assignment 3 Questions With 100% Verified ANSWERs At the venous end of tissue capillaries, there is no net movement of O2 and CO2. - ANSWER true How can Boyle's law be represented? - ANSWER P1V1 = P2V2 What does Boyle's law state? - ANSWER At a constant temperature, the pressure exerted by a gas varies inversely with the volume of that gas. Which of the following is an application of Boyle's Law? - ANSWER At a constant temperature, as the volume of a gas increases, the pressure decreases. As a volume of a gas increases, the number of molecules of that gas that collide with the walls of the container decreases. - ANSWER true As the lungs expand while breathing, the pressure in the lungs decreases. - ANSWER true Inspiration begins as __________. - ANSWER the diaphragm contracts What is the result of inspiration? - ANSWER An increased alveolar volume causes decreased alveolar pressure. Which of the following occurs during expiration? - ANSWER Decreased alveolar volume causes increased alveolar pressure. The alveoli never attain equal pressure with the ambient (outside) air. - ANSWER false If the volume of the alveoli increased, the pressure would decrease. - ANSWER true What is the layer of the pleural membrane that is attached to the surface of the lung? - ANSWER visceral pleura What is the outermost layer of the pleural membrane? - ANSWER Parietal pleura What is the fluid filled area between the pleural layers called? - ANSWER Pleural cavity The pleural membranes function like a fluid filled balloon that completely surrounds the heart. - ANSWER false What determines the direction of gas movement? - ANSWER The partial pressure differences Which of the following statements about partial pressures of gases in the lungs is true? - ANSWER Po2 in the lungs Po2 in the blood; Pco2 in the lungs Pco2 in the blood Which of the following statements about partial pressures of gases in the tissues is true? - ANSWER Po2 in blood Po2 in tissues; Pco2 in blood Pco2 in tissues Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart. - ANSWER false Oxygen-poor blood is carried through systemic veins from the body tissues back to the heart. - ANSWER true Which of the following is true at the arterial ends of the pulmonary capillaries? - ANSWER The Po2 is lower in the capillaries than in the alveoli. Which of the following is true at the venous ends of the pulmonary capillaries? - ANSWER The Pco2 is equal in the capillaries and in the alveoli. At the arterial end of a tissue capillary, rank the following structures from highest to lowest Po2. - ANSWER Capillaries, tissue fluid, cells When partial pressures for a given gas are equal between the capillaries and the tissue fluids, no net movement of that gas occurs. - ANSWER true Gases diffuse because of differences in partial pressures from areas of higher pressure to areas of lower pressure. - ANSWER true The partial pressure of a gas is measured in millimeters of mercury. - ANSWER true