In comparison to the partial pressure of oxygen (PO2) in atmospheric air:______ A. The PO2 in the alveoli is the same due to diffusion. B. The PO2 in the alveoli is lower because some air stays in the lungs at the end of expiration. C. The PO2 of the arterial blood is higher. D. The partial pressure of CO2 in atmospheric air is higher. E. The PO2 of the venous blood is higher.
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Step 1: The partial pressure of oxygen (PO2) in the alveoli is lower than the PO2 in atmospheric air. Show more…
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Air enters the human lungs because a. atmospheric pressure is less than the pressure inside the lungs. b. atmospheric pressure is greater than the pressure inside the lungs. c. although the pressures are the same inside and outside, the partial pressure of oxygen is lower within the lungs. d. the residual air in the lungs causes the partial pressure of oxygen to be less than it is outside. e. the process of breathing pushes air into the lungs.
Which of the following statements about the partial pressures of gases is TRUE? Multiple Choice The Po2 in pulmonary arterial blood is greater than the Po2 in pulmonary venous blood. The Po2 in systemic arterial blood is less than the Po2 in tissue cells. The Po2 in pulmonary venous blood is greater than the Po2 in tissue cells. The Po2 in systemic venous blood is greater than the Po2 in systemic arterial blood. The Po2 in pulmonary venous blood is greater than the Po2 in the alveoli.
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Why is the partial pressure of oxygen lower in the lung than in the external air? a. Oxygen is constantly being removed by air in the lungs through the blood. b. Carbon dioxide does not mix with oxygen in the lung. c. The lungs exert pressure on the air to reduce the oxygen pressure. d. Changes in water vapor pressure cause less oxygen to enter the air in the lungs.
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