Which one of the below is not a function of the respiratory…

Biology Breathing and Exchange of Gases Skill Builder Single Correct MCQ

Published on: August 13, 2026

Which one of the below is not a function of the respiratory system?

Allows oxygen from the air to enter the blood and carbon dioxide to leave the blood and enter the air.

Can alter the pH by changing oxygen levels

Provides protection against some microorganisms by preventing their entry into the body and by removing them from respiratory surfaces.

Allows for speech and sound generation.

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By using , the respiratory system adjusts pH . When we expire, is projected into the environment. As carbon dioxide forms carbonic acid in the body when it combines with water, the amount of carbon dioxide expired can cause pH to increase or decrease.

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