How does the oocyte continue to engage in nutrient/waste and gas exchange across

Question

How does the oocyte continue to engage in nutrient/waste and gas exchange across this barrier of glycoprotein? As the follicle develops into a secondary follicle, the follicular cells specialize into two different functional layers. What is the external layer called? What is the internal layer called, and what hormone is it responsible for secreting? Follicular cells also start secreting fluid, which results in formation of a large fluid-filled space/cavity within the follicle. What is this cavity called?

Explanation / Answer

1 the glycoproteins layer around the oocyte is called Zona pellucida. This layer is composed of various carbohydrates and protein structures known as ZP proteins . Various ZP proteins forms different types of channels in this relatively hard and protective layer which thereby permits permeation of various Marco molecules .

2. The external layer in secondary follicle is known as Theca externa.

3. The internal layer is called theca interna and it secretes estrogen.

4. The cavity is called antrum.

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