The muscular organ that contracts and expands, forcing air into and out of the lungs is the

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Prepare for the Ohio Esthetics State Board Exam with our comprehensive quiz. Use flashcards and multiple choice questions with explanations to ensure your success on test day.

Multiple Choice

The muscular organ that contracts and expands, forcing air into and out of the lungs is the

Explanation:
The diaphragm is the main muscle of respiration. When it contracts, it flattens and moves downward, increasing the chest cavity’s volume and drawing air into the lungs. When it relaxes, it moves back up, decreasing the volume and pushing air out. The heart pumps blood, the lungs are elastic air sacs, and the trachea is a rigid airway—none of those drive the breathing cycle like the diaphragm does.

The diaphragm is the main muscle of respiration. When it contracts, it flattens and moves downward, increasing the chest cavity’s volume and drawing air into the lungs. When it relaxes, it moves back up, decreasing the volume and pushing air out. The heart pumps blood, the lungs are elastic air sacs, and the trachea is a rigid airway—none of those drive the breathing cycle like the diaphragm does.

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