During external respiration, the $\mathrm { P } _ { \mathrm { O } _ { 2 } }$ is greater in the alveoli than in the blood of the pulmonary capillaries.

Question

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During external respiration, oxygen diffuses from the alveoli into the pulmonary capillaries where the $\mathrm { P } _ { \mathrm { O } _ { 2 } }$ is lower than that in the alveoli. This facilitates the diffusion of oxygen from an area of high concentration to an area of low concentration. As a result, the $\mathrm { P } _ { \mathrm { O } _ { 2 } }$ is greater in the alveoli than in the blood of the pulmonary capillaries.

During External Respiration, The PO2\mathrm { P } _ { \mathrm { O } _ { 2 } }PO2​​

During External Respiration, The $\mathrm { P } _ { \mathrm { O } _ { 2 } }$