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What Is Ovulation?

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Question

What is the role of zona pellucida in implantation?

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Solution

The zona pellucida is a thick extracellular coat that surrounds all mammalian eggs and preimplantation embryos.
Role of zona pellucida in implantation:
1. It provides physical support for the blastomeres, inhibition of inappropriate tubal implantation, and protection from the maternal immune system.
2. It acts as a barrier to sperm–oocyte interaction, polyspermy, and embryo uterine interaction before implantation.

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Zona pellucida disappears when blastocyst reaches the uterus.

Reason: Role of zona pellucida is to check the implantation of the blastocyst at an improper site.

Q. Role of zona pellucida is to

Q. For the proper implantation to occur, the zona pellucida layer of the zygote has to be removed. Which of the following is the most suitable site for the complete loss of zona pellucida layer?

Q. If in the blastocyst, rupture of zona pellucida layer or zona hatching occurs before time, which among the following could be the possibilities?
1. Implantation occurs in the ampullary region of the fallopian tube
2. Tubular implantation
3. Endometrial implantation

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