Question

During which period of pregnancy, foetus or ambryo is very sensitive to anything that interferes with cell division, cell emigration and cell differentiation?

• A. First trimester
• B. Second trimester
• C. Third trimester
• D. Both first and second trimester

Answer 1

The correct option is A First trimester

The first trimester of pregnancy is designated as the 12th-14th week of pregnancy that is countable from the first day of the last menstrual period. Any kind of interference and harmful exposure during the first trimester may lead to major birth defects. This is due to the several important developmental changes and major structure formation (head, leg, and spine) occur during the first trimester. Apart from that, the development of major organs (heart, lungs, and stomach) also start at this stage.

So, the correct answer is option A, First Trimester.