Which change occurs during normal inspiration?
Correct answer: C. The diaphragm contracts and moves downward
- A. The diaphragm relaxes and moves upward
- B. Thoracic volume decreases and pressure rises
- C. The diaphragm contracts and moves downward
- D. The lungs compress and push air outward
Explanation
During inspiration, the diaphragm contracts and flattens, increasing thoracic volume. Intrapulmonary pressure then falls below atmospheric pressure, so air flows into the lungs.
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About Respiratory System
The respiratory system includes the air passages, lungs, pleura, alveoli and the mechanics of breathing. It explains pulmonary ventilation, gas exchange, oxygen and carbon dioxide transport, regulation of breathing, and the difference between external respiration in the lungs and internal respiration in body tissues.
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