| Alveoli | Nephron |
|---|---|
| < strong>Structure | < strong>Structure |
| $(i)$ Alveoli are tiny balloon-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 contain an extensive network of blood capillaries. | $(ii)$ Nephrons consist of a glomerulus,Bowman's capsule,and a long renal tubule. They also contain a cluster of thin-walled capillaries. |
| < strong>Function | < strong>Function |
| $(i)$ The exchange of $O_2$ and $CO_2$ takes place between the blood of the capillaries surrounding the alveoli and the gases present in the alveoli. | $(i)$ Blood enters the kidneys through the renal artery,which branches into many capillaries in the glomerulus. Water and solutes are transferred to the nephron at Bowman's capsule. The filtrate then moves through the proximal tubule,the loop of Henle,the distal tubule,and finally into the collecting duct. During this process,substances like glucose,amino acids,and water are selectively reabsorbed. |
| $(ii)$ Alveoli are the primary site of gaseous exchange. | $(ii)$ Nephrons are the basic filtration units of the kidney. |
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