Functional units of lungs are called________?
Correct answer: A. Alveoli
- A. Alveoli
- B. Air sacs
- C. Parabronchi
- D. None of these
Explanation
Alveoli are the microscopic air sacs where oxygen and carbon dioxide diffuse between the air and pulmonary capillaries, making them the functional units of mammalian lungs. Students may choose air sacs because alveoli are air sacs, but that option is a general description rather than the precise anatomical term.
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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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