The partial pressure of carbon dioxide is highest in the
Correct answer: C. respiring tissues
- A. alveolar air
- B. arterial blood
- C. respiring tissues
- D. pulmonary vein
Explanation
Cells produce CO2 continuously, so its pressure peaks in the tissues and falls stepwise into venous blood, alveoli and finally the expired air. The gradient is what drives CO2 out of the body.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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