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  4. The given figure shows the diagrammatic sectional view of female reproductive system with few structures marked as A, B, C, and D. Select the option which shows the correct identification of the structure with its characteristics.

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Q. The given figure shows the diagrammatic sectional view of female reproductive system with few structures marked as $A, B, C$, and $D$.
Select the option which shows the correct identification of the structure with its characteristics.Biology Question Image

Human Reproduction

Solution:

The structure marked as $A, B, C$ and $D$ in the given figure of female reproductive system are respectively isthmus, ampulla, infundibulum and fimbriae. Isthmus is the narrower part of the tube that links to the uterus and the interstitial part that transverses the uterine musculature. Ampulla is the part behind the infundibulum, where fertilization of ovum takes place. Infundibulum is a funnel shaped structure whose edges possess finger like projection called fimbriae. Fimbriae help in the collection of ovum after ovulation.