Explain the mechanism of breathing in humans.
Answer (1)
Breathing involves two stages, which are well-explained in NCERT Solutions for Class 11 Biology Chapter 14 Breathing and Exchange of Gases:
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Inspiration : The diaphragm contracts and flattens, and external intercostal muscles lift the ribs, increasing thoracic volume and decreasing pressure inside the lungs, causing air to flow in.
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Expiration : The diaphragm and intercostal muscles relax, decreasing thoracic volume and increasing lung pressure, pushing air out
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