Free Respiratory Physiology MCQs with Answers
46 Respiratory Physiology MCQs from Physiology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
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- A. Rise in pH
- B. Rise in carbon dioxide tension
- C. Rise in temperature
- D. Rise in H+ ion
Explanation: A rise in temperature, CO₂, or H⁺ shifts the curve rightward and promotes oxygen unloading.
Correct answer: Rise in pH- A. Cyanosis
- B. Hypercapnia
- C. Dyspnea
- D. Hypoxia
Explanation: Hypoventilation reduces CO₂ elimination, so arterial CO₂ rises and hypercapnia is the defining biochemical abnormality.
Correct answer: Hypercapnia43. During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?
- A. Positive
- B. Less negative
- C. More negative
- D. Equal to the intra alveolar pressure
Explanation: Diaphragmatic contraction enlarges the thoracic cavity and makes intrapleural pressure more negative.
Correct answer: More negative- A. Bicarbonate
- B. Carbomino compounds
- C. Dissolved
- D. CO
Explanation: Most carbon dioxide is converted inside red blood cells to bicarbonate, which then circulates in the plasma; only a smaller fraction is…
Correct answer: Bicarbonate- A. Cerebrum
- B. Medulla oblongata
- C. Hypothalamus
- D. Cerebellum
Explanation: The medulla contains the essential respiratory rhythm-generating centres, so its destruction stops the automatic drive to breathe.
Correct answer: Medulla oblongata- A. Midbrain
- B. Spinal cord
- C. Medulla oblongata
- D. HypothalamusTry Nootropic Supplements
Explanation: The medulla contains the main dorsal and ventral respiratory groups that generate and regulate the basic breathing rhythm.
Correct answer: Medulla oblongata