Powerpoint slides on Fertilization

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These slides will explain the process of fertilization and pregnancy.

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Powerpoint slides on Fertilization

  1. 1. How are Babies Made? Definition: Fertilisation is the fusion of the nuclei in a sperm and an egg to form a new life. Fertilisation normally occurs during sexual intercourse. What is Fertilisation ??? sperm + egg = fertilised egg
  2. 2. Fertilisation Human life begins at fertilisation. Fertilisation is the union of a sperm and an egg usually in the fallopian tube to form a fertilised egg or zygote.
  3. 3. How are Babies Made? uterus egg ovary testis penis is inserted into the vagina during sexual intercourse millions of sperm are released from the penis are are deposited in the vagina sperms swim from vagina up the uterus and into the fallopian tubes; many sperms die before reaching these tubes if a sperm meets an egg in a fallopian tube, fertilisation takes place; only one sperm will fertilise the egg the fertilised egg/zygote begins to divide to form a small ball of cells the small ball of cells (now embryo) moves down the fallopian tube and enters the uterus fertilised egg embryo uterus penis vagina uterus bladder
  4. 4. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). – gestation period During implantation, the embryo reaches the uterus and attaches itself onto the wall of the uterus. Cell division continues. First week
  5. 5. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). After the placenta develops in the wall of the uterus, the embryo joins to via an umbilical cord. The embryo receives food and oxygen from the mother and pass waste substances back through the umbilical cord and placenta. The placenta also stops infections and harmful substances from reaching the embryo. A surrounding liquid also protects the embryo. After 2 weeks
  6. 6. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). Eyes, arms and legs begin to form. A little tail is also visible. After 4 weeks
  7. 7. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). Nose, ears and fingers can be seen. After 7 weeks
  8. 8. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). Embryo looks like a baby. From this stage until birth, embryo is called a foetus. After 11 weeks
  9. 9. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). The foetus looks more and more like a human baby. The fingers and toes can be seen clearly. After 20 weeks
  10. 10. A New Life is Born When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). After about 9 months, the baby is born. After 38 weeks
  11. 11. A New Life is Born When the baby is about to be born, the head of the baby faces down. Muscles in the uterus push the baby down. muscles of uterus The membrane around the foetus breaks and the liquid comes out. membrane around the foetus Mother uses her muscles to push the baby out of the vagina. Baby comes out with the umbilical cord attached. Doctor cuts and ties the cord. Placenta is released from the vagina as it is no longer needed. umbilical cord placenta vagina

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