Question
- Study the given structure carefully and label the parts given as A, B, C, D and E.
- Give one major function of each of these.


A - Afferent arteriole.
B - Proximal convoluted tubule.
C - Glomerulus.
D - Loop of Henle.
E - Collecting duct.
A - Carry blood to glomerulus for ultrafiltration.
B - Selective reabsorption of useful substances.
C - Ultrafiltration of blood.
D - Maintenance of the high osmolarity of medullary interstitial fluid.
E - Reabsorption of water to form hypertonic urine.
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| Phylum/ Class | Excretory Organ | Circulatory Organ | Respiratory Organ |
| Arthropoda | - | - | Lungs/ Gills/ Tracheal System |
| - | Nephridia | Closed | Skin/parapodia |
| - | Metanephridia | Open | - |
| Amphibia | - | Closed | Lung |