NEET 2017 Biology question
Lungs are made up of air-filled sacs the alveoli. They do not collapse even after forceful expiration, because of :
Answer: (1)
Solution
Even after a maximal (forceful) expiration, about 1100-1200 mL of air remains in the lungs; this is the residual volume (RV). It keeps the alveoli inflated and prevents their collapse. Inspiratory reserve volume is the extra
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