Inspiration mechanics: which muscles contract?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Prepare for the NREMT Advanced-EMT Test. Use flashcards and multiple choice questions, complete with hints and explanations. Ready yourself for success on your exam!

Multiple Choice

Inspiration mechanics: which muscles contract?

Explanation:
Inspiration mainly relies on enlarging the chest cavity. The diaphragm contracts and moves downward, increasing vertical space in the thorax, while the external intercostal muscles contract to lift the ribs and widen the chest. This combined expansion lowers the pressure inside the lungs, drawing air in. Abdominal muscles do not drive inspiration; when they contract they push the diaphragm upward and help with expiration, not filling the lungs. In normal breathing, the diaphragm and intercostals do the bulk of the work, with accessory muscles only coming into play during heavy or labored breathing.

Inspiration mainly relies on enlarging the chest cavity. The diaphragm contracts and moves downward, increasing vertical space in the thorax, while the external intercostal muscles contract to lift the ribs and widen the chest. This combined expansion lowers the pressure inside the lungs, drawing air in. Abdominal muscles do not drive inspiration; when they contract they push the diaphragm upward and help with expiration, not filling the lungs. In normal breathing, the diaphragm and intercostals do the bulk of the work, with accessory muscles only coming into play during heavy or labored breathing.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy