question_answer

\[C{{a}^{2+}}\] is very important for fertilisation in humans. In the absence of\[C{{a}^{2+}}\], fertilisation does not occur. Comment.

Answer:

\[C{{a}^{2+}}\] along with magnesium plays an important role in acrosomal reaction. The capacitated sperms undergo acrosomal reaction to release sperm lysins, which help in the activation of oocyte.

These are

· Hyaluronidase It acts on ground substance of follicle cells.

· Corona penetrating enzyme It dissolves corona radiata.

· Zona lysin It digests the zona pellucida. These sperm lysins thus facilitate fusion of male and female gamete, i.e. fertilisation forming a zygote.