What is correct at the alveoli?

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(A) At the level of the alveoli,the partial pressure of oxygen $(PO_2)$ is high (approximately $104 \ mmHg$) compared to the deoxygenated blood arrivi

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High $PO_2$

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(A) At the level of the alveoli,the partial pressure of oxygen $(PO_2)$ is high (approximately $104 \ mmHg$) compared to the deoxygenated blood arriving from the tissues $(40 \ mmHg)$.This high $PO_2$ facilitates the diffusion of oxygen from the alveoli into the blood.Conversely,the partial pressure of carbon dioxide $(PCO_2)$ is low in the alveoli $(40 \ mmHg)$ compared to the blood $(45 \ mmHg)$,allowing $CO_2$ to diffuse out of the blood into the alveoli.Factors like high $PCO_2$,high $H^+$ concentration,and higher temperature are characteristic of tissues,which promote the dissociation of oxygen from hemoglobin (the Bohr effect).

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