NCLEX RN Questions on Respiratory System Related

Review NCLEX RN Questions on Respiratory System related questions and content

In human beings, rib case and sternum move upwardly and outwardly during

  • A. Exercise
  • B. Sudden back injury
  • C. Expiration
  • D. Inspiration
Correct Answer: D

Rationale: During inspiration, the diaphragm contracts and moves downward, while the intercostal muscles contract to lift the rib cage and sternum upward and outward to increase lung volume for air intake. This creates a negative pressure in the lungs, allowing air to be drawn in. In contrast, expiration involves relaxation of the diaphragm and intercostal muscles, leading to the rib cage and sternum moving downward and inward to expel air. Therefore, the correct answer is D: Inspiration. Choices A, B, and C are incorrect as they do not specifically involve the physiological process of rib cage and sternum movement related to breathing.