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27. The structure that is left behind to secrete progesterone once the egg is ovulated is the: 28. The antrum begins to devel
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27. Corpus luteum.

Once the egg is ovulated and the left empty follicle in the ovary is corpus luteum that secreates progesterone and oestrogen.

28. Secondary.

The development of antrum(fluid filled cavity) takes place in the secondary follicle stage.

29. Myometrium is the middle layer of the uterine wall, mainly of uterine smooth muscles. It plays role in uterine contractions.

30. Ampulla-isthmus junction.

Fertilization takes place in the fallopian tube at the ampulla-isthmus junction. Fertilization only happens if sperm and ovum are transported simultaneously in ampulla-isthmus junction.

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