LASTS 28 DAYS ,IT INVOLVES:
- A FOLLICLE DEVELOPING IN OVARY
- OVULATION - EGG RELEASED
- UTERUS LINGINNG BECOMING THCIKER SO THAT A FERTILISED EGG CAN IMPLANT
- A STRUCYRE CALLED A CORPUS LUTEUM DEVELOPING IN REMAINS OF FOLLICLE
IF NO FERTILISATION, THE UTERUS LINING BREAKS DOWN AND LEAVE THE BODY THROUGH VAGINA - MEUSTRATION
CONTRLLED BY ACTION OF 4 HORMONES:
- FOLLICLE STIMULATING HORMONE - stimulates folicle to develop - secreted by pitutary gland
- LUTENISING HORMONE - stimulates ovulation and corpus luteum to develop - secreted by pitutary gland
- OESTROGEN - stimulates uteruslining to thicken - secreted by ovaries
- PROGESTERONE - maintains the thick uterus linng - ovaries
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