During inspiration, the diaphragm
Correct answer: B. Contracts and flattens
- A. Relaxes and domes up
- B. Contracts and flattens
- C. Remains unchanged
- D. Contracts and domes up
Explanation
During inspiration, the diaphragm contracts and flattens, increasing thoracic volume and drawing air in.
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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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