Parabronchi are open at ______________ end/s?
Correct answer: B. Both
- A. Single
- B. Both
- C. Do not have opening
- D. None of these
Explanation
Parabronchi are the fine respiratory tubes in bird lungs, and they are open at both ends. Air flows through them continuously, while capillaries around them receive oxygen by cross-current exchange. A student may choose single because many ordinary air passages are described as having one inlet and one outlet without recognising that both ends of a parabronchus are open.
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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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