Fertilisation Flashcards

1
Q

When and where does fertilisation occur?

A
  • in the outer third of the fallopian tube
  • when the nuclei of the sperm and egg fuse to form a zygote
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2
Q

What happens after semen is deposited in the vagina?

A
  • sperm move through the cervix, uterus and into the fallopian tubes until they reach the egg
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3
Q

What happens to the egg during fertilisation?

A
  • the egg, surrounded by follicle cells, is sucked into the fallopian tube by action of the fimbriae
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4
Q

What happens during step 1 of fertilisation?

A
  1. thousands of sperm surround the egg
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5
Q

What happens during step 2 of fertilisation?

A
  1. hydrolytic enzymes, released from the acrosomes, break down the follicle cells
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6
Q

What happens during step 3 of fertilisation?

A
  1. only one sperm penetrates the membrane of the egg; the tail is discarded
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7
Q

What happens during step 4 of fertilisation?

A
  1. the nuclei of the sperm and egg fuse, forming a diploid zygote
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8
Q

What happens during step 5 of fertilisation?

A
  1. a fertilisation (egg) membrane forms immediately, which prevents other sperm from entering the egg
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