Mucus from the respiratory system that is expelled through the mouth is:
A) Phlegm
B) Saliva
C) Sputum
D) Ketone

Question

Quizplus · Accepted Answer

"Sputum" is the correct term for mucus that is expelled from the respiratory system through the mouth. "Phlegm" is often used interchangeably with sputum, but it specifically refers to mucus from the bronchial tubes and lungs. "Saliva" is produced by the salivary glands and is not related to respiratory mucus. "Ketone" is a chemical produced by the liver during periods of starvation or low-carbohydrate diets and is not related to respiratory mucus.

Mucus from the Respiratory System That Is Expelled Through the Mouth