A protective function of the respiratory system would be A) altering blood pH by changing blood CO₂ levels. B) olfaction by drawing molecules into the nasal cavity. C) producing ACE which helps regulate blood pressure. D) preventing microorganisms from entering the body.

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Quizplus · Accepted Answer

The respiratory system has several protective functions, one of which is preventing microorganisms from entering the body. This is achieved through various mechanisms such as the filtration of air by nasal hairs, the trapping of particles in mucus, and the action of cilia to move mucus and trapped particles out of the respiratory system.

A Protective Function of the Respiratory System Would Be