NEET BIOLOGY

Detailed explanation-1: -Generally, it’s called an embryo from conception until the eighth week of development. After the eighth week, it’s called a fetus until it’s born.

Detailed explanation-2: -A fetus is a prenatal human being between the embryonic stage and birth. The fetal stage extends from the beginning of the ninth week after fertilization to about 38 weeks after fertilization, which is the average time of birth. The fetal stage lasts a total of approximately 30 weeks.

Detailed explanation-3: -A pregnancy is divided into three stages called trimesters: first trimester, second trimester, and third trimester. A trimester lasts between 12 and 14 weeks, while a full-term pregnancy lasts around 40 weeks from the first day of a woman’s last period.

Detailed explanation-4: -Fetal Stage Once cell differentiation is mostly complete, the embryo enters the next stage and becomes known as a fetus. The fetal period of prenatal develop marks more important changes in the brain. This period of development begins during the ninth week and lasts until birth.

Detailed explanation-5: -From beginning as a one-cell structure to your birth, your prenatal development occurred in an orderly and delicate sequence. There are three stages of prenatal development: germinal, embryonic, and fetal.