Question

18. The functional unit of a lung
is
(a) Trachea
(b) Bronchus
(c) Bronchiole
(d) Alveolus​

Answer 1

Answer:

Alveolus

Step-by-step explanation:

Lung tissue consists mainly of alveoli. These tiny air sacs are the functional units of the lungs where gas exchange takes place. The two lungs may contain as many as 700 million alveoli, providing a huge total surface area for gas exchange to take place.

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Answer 2

Answer:

The functional unit of a lung is Alveolus.