What happens to the muscles of diaphragm and internal intercostal muscles during exhalationin humans?
Correct answer: D. D
- A. A
- B. B
- C. C
- D. D
Explanation
During exhalation in humans, the diaphragm relaxes, causing it to move upwards into the thoracic cavity. This reduces the volume of the thoracic cavity, pushing air out of the lungs. Simultaneously, the internal intercostal muscles contract, which further reduces the volume of the thoracic cavity by pulling the ribs down and inwards. Option D is correct because it accurately describes these muscle actions. Options A, C, and B are incorrect because they do not accurately describe the relaxation and contraction pattern of these muscles during exhalation.
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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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