Question

what in kidneys is analogous to alveoli in lungs

Answer 1

Alveoli are the functional unit of lungs. Similarly nephrons are the functional unit of kidney's.

Answer 2

Answer:

Lungs are the one main of the main respiratory organ, that aids in exchange of gases. The "structural" and "functional" unit of lungs that helps in this gaseous exchange are the Alveoli.

Kidney is one main organs of excretion that helps to eliminate wastes products in the form of urine mainly and the "structural" and "functional" unit of kidney that helps in this process of excretion is Nephron. Hence, it is the Nephrons in kidneys that is analogous to alveoli in lungs.