MCQ
Counter-current mechanism operates in
- ✓Vasa rectae and Henle's loop
- BHenle's loop
- CProximal convoluted tubule
- DDistal convoluted tubule
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| Column $I$ | Column $II$ |
| ($a$) Aptenodytes | ($i$) Flying fox |
| ($b$) Pteropus | ($ii$) Angel fish |
| ($c$) Pterophyllum | ($iii$) Lamprey |
| ($d$) Petromyzon | ($iv$) Penguin |
$I$.Coelomic cavity $II$. Level of organisation $III$. Notochord $IV$. Skeletal structure