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

3. THE FEMALE REPRODUCTIVE SYSTEM

4. 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.

5. http://www. youtube. com/watch

6. THE OVARIES &
THE EGG CELL

7. THE
MENSTRUAL
CYCLE

8. IN THE MENSTRUAL CYCLE – DIFFERENT THINGS HAPPEN

9. THIS IS ALL A PAIN FOR GIRLS!