Acrosomal reaction of the sperm occurs due to

Options

A. its contact with zona pellucida of the ova
B. reactions within the uterine environment of the female
C. reactions within the epidiymal environment of the male
D. androgens produced in the uterus

Explanation

**Step-by-Step Solution:**

1. **Understanding the Acrosomal Reaction**: The acrosomal reaction is a crucial process in fertilization that occurs when a sperm approaches an egg (ovum).

2. **Sperm Structure**: The sperm has a head, which contains the acrosome, a cap-like structure filled with enzymes.

3. **Binding to Zona Pellucida**: The acrosomal reaction is initiated when the sperm head binds to the zona pellucida, which is a glycoprotein layer surrounding the ovum.

4. **Release of Acrosomal Contents**: Upon binding to the zona pellucida, the acrosome undergoes a reaction that causes it to release its contents.

5. **Enzymatic Action**: The contents released from the acrosome include hydrolytic enzymes, specifically corona penetrating enzymes, which help the sperm penetrate the corona radiata (the outer layer of cells surrounding the ovum).

6. **Purpose of the Reaction**: The acrosomal reaction facilitates the sperm's ability to reach and fertilize the egg by breaking down barriers that protect the ovum.

**Final Answer**: The acrosomal reaction of the sperm occurs due to the binding of the sperm head to the zona pellucida of the ovum, leading to the release of hydrolytic enzymes from the acrosome.

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