Gas Exchange in the Lungs Flashcards

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What are alveoli?

Alveoli are tiny air sacs in the lungs where gas exchange takes place.

What happens in the alveoli when we breathe in?

When we breathe in, oxygen diffuses out of the alveoli and into the blood.

What happens in the alveoli when we breathe out?

When we breathe out, carbon dioxide diffuses out of the blood and into the alveoli.

Why are the walls of the alveoli moist and thin?

The moist, thin walls of the alveoli allow gases to diffuse easily across them.

How does the large surface area of the alveoli help with gas exchange?

The large surface area of the alveoli allows for the diffusion of large quantities of gases at once, supporting the body’s oxygen needs.

Why is the network of capillaries around the alveoli important?

The network of capillaries helps maintain a concentration gradient and quickly transports gases to and from the alveoli, making gas exchange more efficient.