Final answer:
The correct answer to the question on partial pressure of gases is that in the lungs, the partial pressure of oxygen is greater than in blood, and the partial pressure of carbon dioxide is less than in blood, demonstrating the movement of gases according to Dalton's and Henry's laws.
Step-by-step explanation:
The phrase that best describes the partial pressure of gases is that the partial pressure of oxygen in the lungs is greater than in the blood, and the partial pressure of carbon dioxide in the lungs is less than in the blood. Therefore, the correct answer is: in lungs is greater than in blood; in lungs is less than in blood. This description is related to the fact that gas molecules move down a pressure gradient from a region of high pressure to a region of low pressure, in accordance with Dalton's law and Henry's law. Oxygen diffuses across the respiratory membrane from the alveoli, where its pressure is higher, into the blood, where its pressure is lower. Conversely, carbon dioxide diffuses from the blood into the alveoli, where its partial pressure is lower.