When abdomen expands, the number of spiracles open is_____________?
Correct answer: D. 8
- A. 2
- B. 3
- C. 6
- D. 8
Explanation
When the cockroach abdomen expands during inspiration, the eight abdominal pairs of spiracles open to admit air. The two thoracic pairs are generally associated with expiration in the usual textbook description. Students often choose two by counting only the thoracic spiracles and overlooking the eight abdominal pairs.
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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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