Only primates have a menstrual cycle

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Presentation transcript:

Only primates have a menstrual cycle (Primates are the monkeys, apes and humans) Other mammals come into oestrous – “come on heat”

THE FEMALE REPRODUCTIVE SYSTEM

WHY A MENSTRUAL CYCLE? Every month, an ovary releases one egg cell. The egg cell goes into the oviduct, towards the uterus. Fertilisation by a sperm must happen in the oviduct. When the fertilised egg reaches the uterus, it will implant. The uterus must be ready. If the egg is not fertilised, it will be released, with the wall of the uterus. That is menstruation.

http://www. youtube. com/watch http://www.youtube.com/watch?v=nLmg4wSHdxQ&playnext=1&list=PL90C6D6399096FB49

THE OVARIES & THE EGG CELL

THE MENSTRUAL CYCLE

IN THE MENSTRUAL CYCLE – DIFFERENT THINGS HAPPEN

THIS IS ALL A PAIN FOR GIRLS!

http://www.youtube.com/watch?v=vbzq90Iaaic&feature=related

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