Question

What is the function of the Transversus Abdominis muscle in respiration?

1) It helps to expand the ribcage during inhalation
2) It contracts to force air out of the lungs during exhalation
3) It stabilizes the trunk and pelvis during breathing
4) D. It is not involved in the process of respiration

Answer 1

The Transversus Abdominis muscle helps stabilize the trunk and pelvis during breathing; it does not play a direct role in expanding the ribcage or forcing air out of the lungs.

Step-by-step explanation:

The function of the Transversus Abdominis muscle in respiration is to stabilize the trunk and pelvis during breathing (option 3). This muscle is not primarily used to help expand the ribcage or to force air out of the lungs during respiration. The diaphragm and intercostal muscles play more significant roles during the process of breathing. The diaphragm is the main muscle involved in inhalation, when it contracts, the thoracic cavity expands allowing air to flow into the lungs. During forced exhalation, the internal intercostal muscles and other abdominal muscles may be involved in forcing air out of the lungs by decreasing thoracic volume and increasing pressure.