Why are there lots of alveoli in the lungs?

Answer 1

They increase the surface area which increases the rate of gas exchange.

Alveoli hugely increase the surface area of the lungs. This increases the area over which gas exchange can occur, which in turn increases the rate of gas exchange. This allows the rate of oxygen diffusion into the blood to be large enough to supply the body with oxygen.

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Answer 2

Lydia Adams

The lungs' large surface area makes it easier for gases to exchange between the air in the lungs and the blood capillaries, which ensures effective oxygenation of the blood and removal of carbon dioxide, which is crucial for cellular respiration and overall body function. The lungs' many alveoli increase the surface area available for gas exchange, allowing for efficient absorption of oxygen from inhaled air and release of carbon dioxide from the bloodstream into exhaled air.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.