HELP!!

Which features of alveoli enable them to exchange gases efficiently? (Select all that apply.)


A. thin walls

B. surrounded by blood vessels

C. small numbers of them in each lung

D. large surface area

Do not scam me using links or attachments (except photos of the answer) or answer this by saying a simple yes or no because that also scams me.

Answer:

the answer is a i hope this helps

Explanation:

The sac-like structure of the alveoli increases their surface area. In addition, the alveoli are made of thin-walled parenchymal cells. These features allow gases to easily diffuse across the cells. so the

Alveoli has thin walls which are surrounded by blood vessels, and they have maximized are for gas exchange. Thus, option A, B, and D are correct.

These are basic respiratory units, which are balloon like structure present in the lungs, where exchange of gases takes place. A pair of human lungs can contain approximately 480 million alveoli, which produces about, 50 to 75 square meters surface are.

Alveoli are made of thin walls, and they are covered by a rich blood supply through capillaries, this supplies a diffusion gradient for oxygen to move into the blood and carbon dioxide to move into the lungs.

Therefore, the larger surface area, presence of thin wall, which is only one cell thick,  and rich blood supply due to presence of blood vessels enable them to exchange gases efficiently.

Learn more about alveoli, here:

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help please i have to do it now!!!!

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