Which statement accurately describes alveolar exchange of oxygen? Oxygen diffuse
ID: 79402 • Letter: W
Question
Which statement accurately describes alveolar exchange of oxygen? Oxygen diffuses from the blood to the alveolus has a lower partial pressure of oxygen. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen.________________ As blood travels through a systemic capillary and exchanges gases with systemic cells, the partial pressure of oxygen in blood increases as it goes from arterioles to venules. the partial pressure of oxygen on blood remains the same as it goes from arterioles to venules. the partial pressure of oxygen in blood decreases as it goes from arterioles to venules. ______________ Which reaction involving CO_2 predominates within erythrocytes in the pulmonary capillaries of the lung? CO_2 combines with water to form bicarbonate ion and carbonic acid. HCO_3^-2 dissociates into H^+, CO, and O_2. CO_2 combines with H^+ to form HCO_2. HCO_3^- combines with H^+ to form H_2CO_3, which dissociates into CO_2 and H_2O. _______________ About 70% of the CO_2 that diffuses into systemic capillaries combines with water to form carbonic acid, which then dissociates into bicarbonate and hydrogen ions. forms carbonic anhydrase, which combines carbonic acid and water to solubilize the CO_2 directly dissolves in the plasma binds to hemoglobin.______________ Airway obstruction can lead to hypoventilation, which can cause hypocapnia and respiratory acidosis. hypoxia and respiratory alkalosis. hypocapnia and respiratory alkalosis. hypoxia and respiratory acidosis. hypocapnia and hyperpnea. ________________Explanation / Answer
58 D
The alveolus has a higher PO2 of 100 mm of Hg whereas in the blood capillaries surrounding it, the PO2 is about 40 mm of Hg. Hence the oxygen diffuses out of the alveoli into the capillaries.
59 C
The PO2 steadily increases as blood passes from arteries, arterioles to capillaries and then decreases as it passes on to the venules and veins.
60 D
Bicarbonate ions HCO3— pass into the RBC and bind to H+ which is released and formsH2CO3. The H2CO3 dissociates into water H2O and CO2
61 A
About 70% of the CO2 that diffuses into systemic capillaries
combines with water to form carbonic acid, which then dissociates to bicarbonate and hydrogen ions
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