Blood partial pressure of oxygen is greatest when we inhale
During inhalation, the partial pressure of Oxygen is high in the alveoli and low in the blood inside the pulmonary capillaries. When this happens, oxygen diffuses across the respiratory membrane from the alveoli into the blood. In contrast, the partial pressure of Carbon dioxide is high in the pulmonary capillaries and low in the alveoli, thus diffusing from blood into the lungs, and exhaled from the body.
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