18. The functional unit of a lung
is
(a) Trachea
(b) Bronchus
(c) Bronchiole
(d) Alveolus
Answers
Answered by
0
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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Answered by
1
Answer:
The functional unit of a lung is Alveolus.
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