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प्रश्न
Fill in the following blank with a suitable word:
______ in the lungs provide a very large surface area for gaseous exchange.
रिकाम्या जागा भरा
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उत्तर
Alveoli in the lungs provide a very large surface area for gaseous exchange.
Explanation:
The alveoli are hundreds of millions of microscopic air sacs. If you spread them all out flat, their combined surface area would equal the size of a tennis court. This massive surface area allows your body to exchange oxygen and carbon dioxide rapidly and efficiently.
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