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Human reproduction

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STAGES OF PREGNANCY

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Human reproduction

  1. 1. Human reproduction Reproductive System 6th
  2. 2. SEXUALITY / Human reproduction Human reproduction involves two different sex cells: a female ovum and a male sperm. Each cell carries genetic information. Children have genetic code from their parents. Stages: - Fertilisation - Development of the embryo - Development of the foetus - Birth
  3. 3. STAGES
  4. 4. 1. FERTILISATION • The man’s penis is inserted into the woman’s vagina. • The sperm are deposite there. Then, they swim up the vagina to the ovum. • Only one sperm can fertilise an ovum. • Once the ovum is fertilised, the cells will start to divide and multiply. This ball of cells is called zygote.
  5. 5. 1. FERTILISATION • Scientific Alternatives: • Artificial insemination : it is the introduction of sperms into the female's uterus for the purpose of achieving a pregnancy. • In vitro fertilization : is a process by which an ovum is fertilised by a sperm outside the body. After this, it's introduced in woman's body.
  6. 6. 2. DEVELOPMENT OF EMBRYO • After fertilisation, the zygote travels to the uterus where its cells carry on dividing and multiplying until they become an embryo. • It fixes into the uterus and it will continue to grow.
  7. 7. 3. DEVELOPMENT OF THE FOETUS • After nine weeks, all organs have formed and the embryo develops into a foetus. • The foetus floats in a sac of amniotic fluid which protect its. • The foetus recives oxygen and nourishment (food) from mother’s placenta. • The baby is connected to the placenta by the umbilical cord.
  8. 8. BIRTH • …

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