explain the sequence of changes upto parturation which takes place within female body starting from implantation

The zygote formed after fertilization in the fallopian tubes is implanted in the uterus. The uterus is also known as the womb. Here, the zygote divides to form an embryo, which develops into a foetus.

How is the embryo attached in the uterus?

The uterus is a sac-like structure which opens into the vagina. The wall of the uterus has three layers of tissues:

1. The outer-thin layer is known as the perimetrium.

2. The middle layer is thick and is made up of smooth muscles. It is known as the myometrium. These muscles contract strongly during the delivery of a baby.

3. The inner layer lines the uterine cavity, which has many glands and is known as the endometrium. It thickens every month and is supplied with blood to nourish the embryo. It undergoes cyclic changes during the menstrual cycle.

Therefore, the zygote in the uterus or womb divides many times to form an embryo. This leads to pregnancy.

Within a span of some months, the embryo starts developing limbs, hands, and legs and begins to resemble a miniature human being. When all the body parts of an embryo can be recognized it is known as a foetus. When the foetus is fully developed, the mother gives birth to the baby.