Mark the correct option

Fast block to Polyspermy - Opening of

N a^{+}

channel as the sperm head comes in contact with ovum. - Slow block to Polyspermy - Includes extrusion of cortical granules by

C a^{2 +}

efflux.

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Fast block to Polyspermy - Opening of

K^{+}

channel of the ovum membrane to avoid entry of sperm. - Slow block to Polyspermy - Includes extrusion of cortical granules by

C a^{2 +}

influx.

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Fast block to Polyspermy - Opening of

N a^{+}

channel as the sperm head comes in contact with ovum. - Slow block to Polyspermy - Includes cortical and zona reactions.

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Fast block to Polyspermy - Opening of

K^{+}

channel of the ovum membrane to avoid entry of sperm. - Slow block to Polyspermy - Includes cortical and zona reactions.

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Solution

The correct option is C Fast block to Polyspermy - Opening of $N a^{+}$ channel as the sperm head comes in contact with ovum. - Slow block to Polyspermy - Includes cortical and zona reactions.
Fast block to polyspermy – As the sperm head comes in contact with the fertilization cone, it cause opening of $N a^{+}$ channels to cause depolarization of ovum membrane. This is called fast block to polyspermy.
Slow block to polyspermy – $C a^{2 +}$ influx causes extrusion of cortical granules and zona reactions which make the zona pellucida impervious to second sperm by destroying sperm receptors.

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