Question

What is zona reaction?

Answer 1

Zona reaction:

Zona reaction is referred to as the modification of the zona pellucida in response to fertilization, which altered the solubility and binding properties of the zona pellucida, and led to a slow block of polyspermy.

1. The acrosome is said to be a cap-like structure that is present at the head of the sperm.
2. It usually contains several proteolytic enzymes like hyaluronidase and acrosin.
3. The acrosome reaction is also very essential for the interaction of the male and female gametes.
4. This reaction is also required for penetration of sperm by the zona pellucida of the ovum and then enters the cytoplasm of the ovum.
5. This reaction is also responsible for the completion of meiotic division in the secondary oocyte.
6. The Graafian follicle is referred to as the stage after the first meiotic division has completed but right before ovulation.
7. The secondary oocyte undergoes the first meiotic division and is located eccentrically.
8. It is surrounded by the zona pellucida and a layer of several cells said as the corona radiata.