The following graph shown the level of ovarian hormones during a menstrual cycle. What do 1 and 2 represent?
1 2
1. Progesterone            Estrogen
2. FSH                          LH
3. LH                             FSH
4. Estrogen                   Progesterone

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answer is D.

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Detailed Solution

Oestrogen is secreted by the growing follicles. Graafian follicle, at the end of follicular phase secretes high concentration of it. The progesterone is secreted by the corpus luteum and hence its concentration is high in the luteal phase. The corpus luteum also secretes oestrogen.

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