State the changes that take place in the uterus when:(a) Implantation of embryo has occurred.(b) Female gamete/egg is not fertilised
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a) when the implantation of the embryo had taken place the uterus starts developing the placenta which secretes female hormone to temporarily stop the menstrual cycle uptil delivery.
b) when the fertilisation of the egg does not takes place the thick utrine wall sheds off.... rupturing blood vessels of the uterus and blood comes out in the form of menstrual fluid.
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