The term antrum is applied to

Cavity of Graafian follicle

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Blastocoel

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Archenteron

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None of the above

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Solution

The correct option is A Cavity of Graafian follicle
The Graafian follicle is the follicular stage which has haploid oocyte. The term antrum is applied to the cavity of Graafian follicle as a fluid-filled space.
Blastocoel is a central fluid-filled cavity of the blastula, which arises as a space between blastomeres towards the end of the cleavage stage of the embryos.
Archenteron is the gut cavity of the embryo formed when cells of the future mesoderm and endoderm invaginate at gastrulation.
So, the correct answer is option A.

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