Question

Describe the stages during three trimesters of pregnancy. 

Answer 1

Three Trimesters of Pregnancy:

1. The first trimester: It is the time of most radical change for both the mother and the embryo. During its first 2-4 weeks of development, the embryo obtains nutrients directly from the endometrium. The first trimester is the main period of organogenesis and the development of body organs. At 8 weeks, all the major structures of the adult are present in the rudimentary form and the embryo is called a foetus. It is only 5 cms long. High levels of progesterone initiate changes in the mother’s reproductive system, the maternal part of the placenta grow, the uterus becomes larger, ovulation and the menstrual cycle stops.
2. Second trimester: In the second trimester, the uterus grows enough for the pregnancy to become obvious. The foetus is very active and grows to about 30 cms in length. Hormone levels stabilize as HCG declines, the corpus luteum deteriorates and the placenta completely takes over the production of progesterone which maintains the pregnancy.
3. Third (final) trimester: In the third trimester, the foetus grows to about 3-4 kg in weight and 50 cms in length. As the foetus grows, the uterus expands around it. The mother’s abdominal organs become compressed and displaced, leading to frequent urination, digestive blockages and strain in the back muscles.