What prevents polyspermy? What is the fast block to polyspermy? What occurs during the fast block to polyspermy?

What is the cortical reaction? How does it occur? Why?

How does a sperm make it through the layers of the ovulated oocyte?

What are the layers/structures of the ovulated oocyte that a sperm must travel through to successfully fertilize an egg?

What is the acrosomal reaction? What are the steps involved? How does it occur? Where does this take place? Why is it important?

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