Alveoli | Nephrons |
Structure | |
(i) Alveoli are tiny sac-like structures present inside the lungs. | (i) Nephrons are tubular structures present inside the kidneys. |
(ii) The walls of the alveoli are one cell thick, and it contains a network of blood capillaries. | (ii) Nephrons are made of glomerulus, Bowman’s capsule, and a long tubules. |
Function | |
(i) The exchange of O2 and CO2 takes place between the blood of the capillaries all around the alveoli. | (i) The blood enters the kidneys through the renal artery. The blood is entered here, and the nitrogenous waste in the form of urine is collected by the collecting duct. |
(ii) Alveoli are the site of gaseous exchange. | (ii) Nephrons are the basic filtration unit. |