LUNG FUNCTION-MUSCLES

SUMMARY

INSPIRATORY MUSCLES
1. Diaphragm: main respiratory muscle during quiet breathing (75% of volume change); contracts during inspiration and relaxes during expiration
2. External intercostals
3. Accessory muscles

EXPIRATORY MUSCLES
4. Internal intercostals
5. Abdominal muscles are primarily active during forceful expiration and coughing; they also help push the relaxed diaphragm toward the chest cavity

Reference(s)

Barrett, K.E., Barman, S.M., Boitano, S., Brooks, H.L., Weitz, M., Brian Patrick Kearns, Ganong, W.F. and Mcgraw-Hill Education (Firm (2016). Ganong’s review of medical physiology. 25th ed. New York: Mcgraw Hill Education.
Hall, J.E. and Hall, M.E. (2020). Guyton And Hall Textbook Of Medical Physiology. 14th ed. S.L.: Elsevier - Health Science.
West, J.B. and Luks, A.M. (2021). West’s Pulmonary Pathophysiology. Lippincott Williams & Wilkins.