lungs have a large number of alveoli for:a) maintaining a spongy texture and proper shape.b)more surface area for diffusion of gases.c) more nerve supply.
d)more space to increase volume of inspired air.
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There are about 300 million alveoli in each of the lungs. These tiny air sacs provide an ideal site for the diffusion of the gases into and out of the blood (gas exchange). The alveoli have a very large surface area. This large surface area is the result of all the alveoli being small spheres.
Therefore, the correct answer is option B.
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Alveoli are tiny air sacs in your lungs that take up the oxygen you breathe in and keep your body going. Although they’re microscopic, alveoli are the workhorses of your respiratory system. You have about 480 million alveoli, located at the end of bronchial tubes. When you breathe in, the alveoli expand to take in oxygen.
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