Answer:
A full term pregnancy begins with the woman’s last menstrual period and lasts for around 40 weeks. There are 3 stages of pregnancy which are the first, second, and third trimesters. Each trimester of pregnancy lasts between 12-14 weeks and 3 stages of fetal development. There are three stages of fetal development: germinal, embryonic and fetal during the 1st trimester of pregnancy.
The germinal stage begins at conception when the sperm meets the egg in the fallopian tube and is the shortest stage of fetal development. The sperm fertilizes the egg and creates a zygote. The zygote takes a week to travel to the uterus where it begins cell division. Cell division happens many, many times until it becomes a blastocyst. The blastocyst reaches the uterus and attaches itself to the lining of the uterus. Once the blastocyst is successful in implantation, the body then creates hormones to support the pregnancy and to stop the menstrual cycle.
The embryonic stage begins in the third through the eighth week of pregnancy, The blastocyst begins to take on human characteristics and is now called an embryo. During the embryonic stage, the embryo develops little buds that will become the legs and arms, structure, and organs. The embryo’s heart begins to develop and pulse during this stage. The embryo’s organs and systems have taken shape by the end of the embryonic stage.
The fetal stage is where the embryo becomes a fetus and lasts from the 9th week of pregnancy until birth. Around the 9th week, a sex is assigned to the fetus but can’t be detected yet until around the 19th–20th week of pregnancy. During the 2nd and 3rd trimester, the fetus’ systems and organs continue to grow and the majority of growth, both in length and weight, happens.
Step-by-step explanation:
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