What is the primary muscle of respiration?

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Multiple Choice

What is the primary muscle of respiration?

Explanation:
The main concept is identifying the muscle that does most of the work during normal breathing. The diaphragm is the primary muscle of respiration. When it contracts, it moves downward, expanding the thoracic cavity and lowering intrathoracic pressure, which pulls air into the lungs. Intercostal muscles assist by lifting the ribs and widening the chest, but they don’t drive ventilation on their own. Abdominal muscles are mainly involved in forced expiration and helping push air out by pushing the diaphragm upward. Pectoralis muscles and other accessory muscles can help during heavy or labored breathing but aren’t the main source of inspiration in calm breathing.

The main concept is identifying the muscle that does most of the work during normal breathing. The diaphragm is the primary muscle of respiration. When it contracts, it moves downward, expanding the thoracic cavity and lowering intrathoracic pressure, which pulls air into the lungs. Intercostal muscles assist by lifting the ribs and widening the chest, but they don’t drive ventilation on their own. Abdominal muscles are mainly involved in forced expiration and helping push air out by pushing the diaphragm upward. Pectoralis muscles and other accessory muscles can help during heavy or labored breathing but aren’t the main source of inspiration in calm breathing.

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