Mammalian lungs have enormous number of minute alveoli (air sacs). It – InterviewSolution

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1.	Mammalian lungs have enormous number of minute alveoli (air sacs). It is to allowA. More space for increasing the volume of inspired airB. More surface area for diffusion of gasesC. More spongy texture for keeping lungs in proper shapeD. More nerve supply to keep organs active when working
Answer» Correct Answer - b in mammalian lungs each alveolar duct ends in a passage , called atrium , which leads into a number of rounded alveolar sacs. Each alveolar sac is studded with a large number of air sacs or alveoli. Alveoli are the sites of respiration.

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