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Q3. What changes are observed in the uterus if fertilization does not occur?

Every month, the uterus prepares itself to receive a fertilised egg. Therefore, the inner lining of the uterus becomes thick and is supplied with blood to nourish the embryo. If the egg is not fertilised, then the lining of the uterus breaks down and gets released in the form of blood through the vagina. This lasts for about two to eight days. This cycle occurs every month and is known as the menstrual cycle.

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To receive a fertilised egg the uterus prepares itself by developing a lining of blood, mucous and nutrients to provide nutrtion to the zygote

Incase no fertilistion takes place, the uterine lining is shed off along with the decomposed egg through the vagina. This is called menstruation. This occurs every 28 days which is the menstrual cycle

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