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Gwar [14]
3 years ago
15

I will give the brainiest

Biology
2 answers:
Llana [10]3 years ago
7 0
A.) Motor nerves ^ The brain sends messages to the muscles through Motor nerves ^
ss7ja [257]3 years ago
6 0
The brain sends messages to the muscles through the motor nerves
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In the block to polyspermy, entry of the sperm's contents causes calcium ion levels in the oocyte's cytoplasm to rise, triggering the cortical reaction.

In biology, polyspermy describes the fertilization of an egg by more than one sperm. Diploid organisms normally contain two copies of each chromosome, one from each parent.

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The cortical reaction is a calcium-dependent exocytotic process in which the content of secretory granules is released into the perivitellin space immediately after fertilization, which serves to prevent polyspermic fertilization.

Learn more about  polyspermy here : brainly.com/question/4537960

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