Question

iii) The microscopic air-sacs of the lungs.
iv) The two membranes which protect the lungs......​

Answer 1

Answer:

(I) Alveoli are microscopic air sacs served by the bronchioles. Hundreds of millions of alveoli exist inside each lung. They are the terminal ends of the respiratory tract and the sites of external respiration—the exchange of gases between the air and the bloodstream.

(ll) Luckily, your lungs are covered by two really slick special layers called pleural (say: PLOO-ral) membranes. These membranes are separated by a fluid that allows them to slide around easily while you inhale and exhale.

Answer 2

Answer:

iii) alveoli

iv) pleural membranes

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