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Science 9 Summative I QUATER I1.Why is the lung considered as the primary organ of the respiratory system? A.Because it is the largest organ of the system. B.Because it has two parts: the right and left lungs. C.Because it is located near the middle of the chest cavity. D.Because it contains the alveoli that is responsible for gas exchanges.
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Answer:

Question:Why is the lung considered as the primary organ of the respiratory system?

ANSWER: D.Because it contains the alveoli that is responsible for gas exchanges.

Explanation:

They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called expiration, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.