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State the changes that take place in the uterus when :

(a)  Implantation of embryo has occurred
(b)  Female gamete/egg is not fertilised.
 

Dear student.

a.  Changes that occur in the uterus just after the implantation of the young embryo are;
1. Thickening of the uterus wall and the endometrium, and appearance of cushiony inner walls of the uterus.
2. Rich supply of blood vessels in the walls of the uterus.
3. Stoppage of the menstrual cycle and the menstrual flow and commencement of gestation period.


b. If an egg is not fertilised, the endometrial lining will rupture and will come out through the cervix along with the unfertilised egg, this is known as menstruation.

Regards.

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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 until delivery.
b) When the fertilization of the egg does not takes place the thick uterine wall sheds off rupturing blood vessels of the uterus and blood comes out in the form of menstrual fluid.


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A) Lining becomes thick so as to implant the embryo. B) If egg is not fertilised, then the lining breaks and comes out with unfertilised egg and blood. This is called Menstruation.
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a)the thick lining on the wall helps the embryo providing with nutrition
b)if gamate is not fertilised than the blood lining sheds off and comes out through vagina, mentrual cycle takes place
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