NPTE Physical Therapist Exam Review

Category - Physical Therapy

What causes air to flow into the lungs during inspiration?
  1. A decrease in alveolar pressure as compared to atmospheric pressure
  2. An increase in alveolar pressure as compared to atmospheric pressure
  3. A decrease in osmotic pressure as compared to atmospheric pressure
  4. A decrease in pleural pressure as compared to atmospheric pressure
Explanation
Answer: A - A decrease in alveolar pressure as compared to atmospheric pressure causes air to flow into the lungs during inspiration. Pleural pressure is always slightly negative and does not cause inspiration.
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