What occurs during the coughing reflex in response to mucus accumulation?

• A. Increased heart rate
• B. Filtering of air
• C. Expulsion of mucus
• D. Relaxation of the diaphragm

Answer: (C)

During the coughing reflex, the body initiates a series of coordinated actions primarily aimed at clearing the airways of irritants and mucus. When mucus accumulates in the respiratory tract, it can obstruct airflow and create a sensation of discomfort or difficulty in breathing. As a response, the cough reflex activates.

This reflex involves the rapid contraction of the muscles associated with the diaphragm and the abdominal wall, leading to a forceful expulsion of air from the lungs. This expulsion process is critical for the removal of mucus. By forcibly expelling air, the body can dislodge the accumulated mucus and irritants, ensuring that the airways remain clear for normal respiration.

The other options do not accurately represent the primary purpose or result of the coughing reflex. While increased heart rate might occur during some respiratory events due to increased demand for oxygen, it is not a direct result of the coughing reflex itself. Likewise, filtering of air is a general function of the respiratory system, but not specifically the goal of coughing. Relaxation of the diaphragm does not occur during coughing; rather, the diaphragm contracts to facilitate the expulsion of air. Therefore, the expulsion of mucus is the correct answer, reflecting the primary action of the coughing reflex in response to mucus accumulation