NEET PG DENTAL EXAM

Detailed explanation-1: -The sperm first burrow through the cells of the corona radiata. Then, upon contact with the zona pellucida, the sperm bind to receptors in the zona pellucida. This initiates a process called the acrosomal reaction in which the enzyme-filled “cap” of the sperm, called the acrosome, releases its stored digestive enzymes.

Detailed explanation-2: -In the head of most animal sperm, closely apposed to the anterior end of the nuclear envelope, is a specialized secretory vesicle called the acrosomal vesicle (see Figure 20-25). This vesicle contains hydrolytic enzymes that may help the sperm to penetrate the egg’s outer coat.

Detailed explanation-3: -For fertilization to occur, the sperm must undergo the acrosome reaction. The acrosome is a membrane-bound organelle covering most of the head of the sperm. On interaction with the zona pellucida of the ova, the sperm releases proteolytic enzymes from the acrosome to penetrate and enter the ova.