The partial oxygen pressure is maximum in

Options

(a) alveolar air
(b) arterial blood
(c) venous blood
(d) expired air

Correct Answer:

expired air

Explanation:Partial pressures of oxygen in various parts of the respiratory and circulatory system parts are Inspired air 158, Alveoli 100, Capillaries 40, Arteries 95, Expired air 116.