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Fertilization and Pregnancy

Fertilization and Pregnancy. Fertilization. Also called conception the union of the egg from the mother and sperm from the father An egg is released about once every 28 days About half a billion sperm can be deposited in the vagina. Zygote. The united egg and sperm are called a zygote

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Fertilization and Pregnancy

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  1. Fertilization and Pregnancy

  2. Fertilization • Also called conception • the union of the egg from the mother and sperm from the father • An egg is released about once every 28 days • About half a billion sperm can be deposited in the vagina

  3. Zygote • The united egg and sperm are called a zygote • within 36 hours the zygote is still in the fallopian tubes, it then begins to divide

  4. Implantation • Within four to five days after fertilization the growing zygote reaches the uterus • It floats free for a few days in the uterus • By this time it is made up of about 500 cells

  5. Blastocyst • This structure is no longer a solid mass, it is a hollow sphere • Once the structure becomes a blastocyst, it attaches to the wall of the uterus

  6. Implantation • When the blastocyst attaches to the wall of the uterus

  7. Embryo • After implantation it is known as an embryo

  8. Pregnancy • Once pregnant the embryo begins to produce HCG ( human chorionic gonadtropin) • HCG can be found in the blood of a pregnant women • One week after menstruation should have begun, HCG should be found in the women’s urine

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