Question

mucus coughed up from the respiratory tract is called: a phlegm. b stridor. c hemoptysis. d sputum.

Explanation:

Phlegm is mucus coughed up from the respiratory tract. Stridor is a high - pitched sound during breathing, hemoptysis is coughing up blood, and sputum is a general term for matter coughed up from the respiratory tract but phlegm is a more specific term for mucus.

Answer:

A. phlegm