Just after inhalation the highest partial pressure of oxygen will be in:
Correct answer: D. Expired Air
- A. Alveolar Air
- B. Arterial Blood
- C. Venous Blood
- D. Expired Air
Explanation
The partial pressure of oxygen in maximum in the expired air (116 mm Hg) because during expiration the oxygen that could not be inhaled also moves out, contributing to more partial pressure in exhaled air. A. Alveolar air has 104 mm Hg of partial pressure of oxygen. B. Arterial blood has 95 mm Hg partial pressure of oxygen. C. Venous blood has 40 mm Hg partial pressure of oxygen. D. Expired air has 116 mm Hg partial pressure of oxygen.
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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