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1. Fertilization:
A sperm cell fuses with an egg cell (ovum), creating a single-celled zygote.
This fertilization occurs in the fallopian tube.
2. Blastocyst Development and Implantation:
The zygote undergoes cell division, forming a morula (a solid ball of cells).
The morula continues to divide, becoming a blastocyst (a hollow ball of cells).
The blastocyst travels to the uterus and implants in the uterine wall.
3. Embryo Development (First 8 Weeks):
This is the period of rapid cell division, differentiation, and organ formation.
The blastocyst develops into an embryo, which takes on distinct human characteristics.
Organ systems like the nervous system, circulatory system, and excretory system begin to develop.
By the end of the 8th week, most organs have started to form.
4. Fetal Development (From 9th Week Onward):
The embryo is now referred to as a fetus.
The fetus grows in size, and its organs mature further.
The fetus begins to move and develop more recognizable features.
The fetus continues to develop in the womb until birth.
Key Stages and Timeline:
Week 1-2: Fertilization, zygote formation, cell division, morula formation, and blastocyst formation.
Week 3-8: Embryo development, organogenesis, and formation of major body systems.
Week 9-Birth: Fetal development, growth, and maturation of organs.