Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

During which phase of respiration are the bottom ribs typically treated?

1. Inhalation

2. Exhalation

3. Rest

4. Compression

The correct answer is: Inhalation

The treatment of the bottom ribs typically occurs during inhalation because this phase involves the expansion of the thoracic cavity. When a person inhales, the diaphragm contracts and moves downwards, while the intercostal muscles elevate the ribs. This process creates negative pressure within the thoracic cavity, allowing the lungs to fill with air. Consequently, the lower ribs move laterally and upward to accommodate this expansion. By focusing on the bottom ribs during inhalation, practitioners can help facilitate the proper mechanics of breathing, ensuring that the ribs can fully expand and contribute to optimal lung function. Mobilizing the lower ribs in this phase aids in enhancing respiratory efficiency and alleviating any restrictions that may impede the movement of the diaphragm and associated musculature. During the other phases of respiration, such as exhalation and rest, the focus would be less on active rib motion, as these phases primarily involve the passive recoil of the ribs and lung tissue following inhalation or maintaining a neutral position.