Mechanics of Respiration and Lung Volumes — NEET Biology
📚 Practice ConceptInspiration and expiration are carried out by creating pressure gradients between the atmosphere and the alveoli with the help of specialised muscles – intercostals and diaphragm. Volumes of air involved in these activities can be estimated with the help of spirometer and are of clinical significance.
Which of the above statements regarding the mechanism of breathing are NOT correct? S1: The contraction of diaphragm contributes to the increase in thoracic volume along the antero-posterior axis during inspiration. S2: Forceful expiration is achieved solely by the relaxation of the diaphragm and external intercostal muscles. S3: For inspiration, the intra-pulmonary pressure must become higher than the atmospheric pressure. S4: The movement of air into and out of the lungs is driven by creating a pressure gradient between the lungs and the atmosphere. S5: During normal expiration, the thoracic volume decreases due to the active contraction of internal intercostal muscles.
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