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Breathing and Exchange of Gases

Mechanism of Breathing Practice Questions

20 free Mechanism of Breathing practice questions for the NCERT Biology, each with the correct answer and a detailed explanation. Open any question below, or take the full set as an interactive quiz.

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All Mechanism of Breathing questions

20 questions
  1. Q1. The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere. Inspiration occurs when:
  2. Q2. Which of the following events occurs during the process of inspiration?
  3. Q3. The diaphragm is a specialized muscle that helps in the generation of pressure gradients. Its contraction increases the thoracic volume in the:
  4. Q4. Expiration takes place when the intra-pulmonary pressure is ________ than the atmospheric pressure.
  5. Q5. Which muscles are primarily responsible for the relaxation phase during normal quiet expiration?
  6. Q6. Humans have the ability to increase the strength of both inspiration and expiration using additional muscles located in the:
  7. Q7. What happens to the sternum during the process of inspiration?
  8. Q8. Anatomically, the lungs are situated in an air-tight thoracic chamber. This setup is essential because:
  9. Q9. The relaxation of the diaphragm causes it to become:
  10. Q10. During forceful expiration, which of the following muscles contract?
  11. Q11. The average breathing rate of a healthy human adult is:
  12. Q12. Which clinical instrument is used to estimate the volume of air involved in breathing movements?
  13. Q13. What is the effect of an increase in thoracic volume on intra-pulmonary pressure?
  14. Q14. The intra-pleural pressure is always ________ during normal quiet breathing.
  15. Q15. During expiration, the volume of the thoracic cavity decreases in the dorso-ventral axis due to:
  16. Q16. Which of the following describes the correct sequence of events for inspiration?
  17. Q17. The 'abdominal breathing' often observed in infants and relaxed adults is primarily driven by the:
  18. Q18. Which of the following is an auxiliary muscle used during deep or forced inspiration?
  19. Q19. The pleural fluid helps in the mechanism of breathing by:
  20. Q20. During expiration, the air is expelled from the lungs until: