NEET BIOLOGY

Detailed explanation-1: -Most organs start to develop during the third to eighth weeks following fertilization. They will continue to develop and grow during the following fetal period. The heart is the first functional organ to develop in the embryo.

Detailed explanation-2: -Week 5 is the start of the “embryonic period.” This is when all the baby’s major systems and structures develop.

Detailed explanation-3: -Fetal Development. By the twelfth week of fertilization the embryo moves into the final stage of development called the fetal stage. By now, the fetus has formed all of the organs and structures necessary for a baby, but those organs still need to grow and develop.

Detailed explanation-4: -The first two weeks after conception are known as the germinal stage, the third through the eighth week is known as the embryonic period, and the time from the ninth week until birth is known as the fetal period.