2. why are capillaries and not arteries or veins found in alveoli, nephrons, and villi?

Capillarie are a lot smaller then arteries or veins

discovered the reply for you

Vessel partitions are very skinny as a result of they let ease of switch of molecules to those tissues. That is why capillaries and never arteries or veins are present in alveolar, nephrons, and villi.

Vessel partitions have to be skinny to permit ease to switch of molecules to those tissues

“Vessel partitions have to be skinny to permit ease of switch of molecules to those tissues” is why capillaries and never arteries or veins are present in alveoli, nephrons, and villi. The proper possibility amongst all of the choices which are given within the query is the third possibility or the penultimate possibility. I hope the reply helped you.

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