1.

"The human lungs are designed to have maximum surface area for exchangeof gases". Explain3.

Answer»

Lungscontain millions ofalveoliwhich provide asurfacefor theexchange of gases. An extensive network of blood vessels is present in the wall of thealveoli. By lifting our ribs and flatten the diaphragm, the chest cavity becomes spacious. Air is sucked into thelungsandalveoli.



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