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Journey from Fertilization to Birth: The Miracle of Human Development

This guide details the miraculous process of human development from fertilization to birth. It begins with sperm traveling through the uterus to fertilize the egg in the oviduct, forming a zygote. Following fertilization, the zygote undergoes mitosis and travels to the uterus, where it attaches to the uterine wall, marking the start of pregnancy. This period allows the embryo to develop, with major organs forming in the first trimester. The guide also explores the differences between fraternal and identical twins, encapsulating the wonder of life.

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Journey from Fertilization to Birth: The Miracle of Human Development

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Presentation Transcript

  1. Fertilization to Birth 21.2

  2. Fertilization • Sperm is deposited into the vagina • Travels through the uterus, to the oviducts • Egg fertilized in oviduct • Zygote formed • A Biochemical Event • Only one sperm will fertilize the egg • Sperm releases an enzyme to disrupt the egg membrane • Response of the Egg • Egg releases chemical secretions that prevent penetration by other sperm • Nucleus of sperm fuses with nucleus of egg • Zygote undergoes mitosis

  3. Development before Birth • About seven days to travel to uterus • Attaches to uterine wall • Pregnancy – 9 month time period were fertilized egg will develop into baby • The Embryo • Embryo – first two months of pregnancy • Nutrients from wall of uterus are received by the embryo from villi • Blood vessels develop from the villi and form placenta • Umbilical cord is attached to embryo’s navel and connects with the placenta • Amniotic sac – clear amniotic fluid, that cushions against blows and can store nutrients and wastes • Three months – all major organs form

  4. The Fetus • Fetus – developing baby after first two months • Third month – 8cm – 10cm long, heartbeat heard, feel movements • Fourth month – determine gender of fetus • Seventh month – 30 to 38cm • Ninth month – shifted to head down position, 50cm in length • Multiple Births • Fraternal twins – two eggs, two sperm. • Do not all look alike. • Can be one boy, one girl • Identical twins – one egg, one sperm. • Splits shortly after fertilization. • Must be both girls or both boys.

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