What is the term for the visible usage of muscles not normally involved in breathing?

• A. Accessory muscle use
• B. Septal deviation
• C. Rhinorrhea
• D. Dyspnea

Answer: (A)

The term for the visible usage of muscles not normally involved in breathing is referred to as "accessory muscle use." This occurs when a person has difficulty breathing and engages additional muscles to aid in the process of respiration. Normally, breathing relies on the diaphragm and intercostal muscles. However, during periods of respiratory distress, muscles in the neck (like the sternocleidomastoid) and abdomen may visibly contract to assist with inhalation and exhalation. This can be observed in various conditions such as asthma, chronic obstructive pulmonary disease (COPD), or any situation leading to increased respiratory effort.

The other terms listed are not related to muscle usage during breathing. Septal deviation refers to a condition affecting the nasal septum, impacting airflow, but not breathing mechanics involving muscle usage. Rhinorrhea is the medical term for a runny nose, which is unrelated to respiratory muscles. Dyspnea describes the sensation of breathlessness, which may accompany or result from accessory muscle use, but does not specifically refer to the visible engagement of additional muscular activity during respiration.