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What cells, along with primary oocyte, make a primary follicle?

(a) Granulosa cells

(b) Sertoli cells

(c) Secondary oocytes

(d) Oogonia

This question was addressed to me in an online quiz.

The origin of the question is Human Reproduction topic in division Human Reproduction of Biology – Class 12

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Correct choice is (a) Granulosa cells

For explanation I would say: Oogonium initiates the first round of meiosis but ends up getting arrested at Prophase I resulting in primary oocytes. These primary oocytes are then enveloped by a single layer of granulosa cells, thus forming a primary follicle.

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