Which of the following is a defense mechanism specific to the respiratory tract that can be employed if cilia fail to keep out foreign particles?
A)enzyme secretion
B)coughing
C)histamine production
D)mucus membranes

Question

Quizplus · Accepted Answer

Coughing is a defense mechanism employed by the respiratory tract to expel foreign particles that have made it past the cilia. Enzyme secretion may occur in the digestive tract to break down food, but it is not specific to the respiratory tract. Histamine production is part of the inflammatory response and can cause increased mucus production, but it is not a defense mechanism specific to the respiratory tract. Mucus membranes are present throughout the body and are not specific to the respiratory tract.

Which of the Following Is a Defense Mechanism Specific to the Respiratory