Which term describes the muscles located between the ribs that aid respiration?

Which term describes the muscles located between the ribs that aid respiration?

• A. Intercostal muscles
• B. Diaphragm
• C. Abdominals
• D. Pectoralis minor

Answer: (A)

Intercostal muscles are the group of muscles that lie between adjacent ribs and are directly involved in changing the size of the thoracic cavity during breathing. When you inhale, the external intercostals contract to lift the ribs upward and outward, expanding the chest and allowing air to flow into the lungs. During forced exhalation, the internal intercostals contract to pull the ribs downward and inward, helping compress the chest and push air out. This location between the ribs makes them the primary muscles associated with respiration on the rib cage itself. The diaphragm is a separate muscle that also aids breathing but sits below the lungs, not between the ribs. The abdominals assist with forced expiration and abdominal support, not with moving the ribs themselves. Pectoralis minor can assist with deep breathes when the upper chest is fixed, but it is not the intercostal muscle between the ribs.

Intercostal muscles are the group of muscles that lie between adjacent ribs and are directly involved in changing the size of the thoracic cavity during breathing. When you inhale, the external intercostals contract to lift the ribs upward and outward, expanding the chest and allowing air to flow into the lungs. During forced exhalation, the internal intercostals contract to pull the ribs downward and inward, helping compress the chest and push air out. This location between the ribs makes them the primary muscles associated with respiration on the rib cage itself.

The diaphragm is a separate muscle that also aids breathing but sits below the lungs, not between the ribs. The abdominals assist with forced expiration and abdominal support, not with moving the ribs themselves. Pectoralis minor can assist with deep breathes when the upper chest is fixed, but it is not the intercostal muscle between the ribs.