Alveoli are absent in:
Correct answer: A. Fishes
- A. Fishes
- B. Amphibians
- C. Birds
- D. Mammals
Explanation
Alveoli, small air sacs in the lungs where gas exchange occurs, are present in fishes. Fishes rely on gills rather than alveoli in their lungs for respiration, making them the correct answer. Amphibians, birds, and mammals all have alveoli in their lungs for gas exchange, so they are not the correct answers for this question.
This question appeared on the ETEA MDCAT 2009 paper, which you can sit online with every answer explained.
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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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