Unit 4 human reproduction claudia lucia and teresa s

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Unit 4 human reproduction claudia lucia and teresa s

  1. 1. 4.HUMAN REPRODUCTION By Teresa,Claudia and Lucia.
  2. 2. REPRODUCTION PRIMARY SEXUAL CHARACTERISTIS The reproductive system are the primary sexsual characteristics. We alredy have them when we are born and they are different for male and female.
  3. 3. SECONDARY SEXUAL CHARACTERISTICS The external characteristics which differentiate men from women are called secondary sexual characteristics. During puberty between the ages of eleven and fifteen the reproductive system matures.Some physical changes are the same for both sexes, like growing taller or hair growing in the armpit.
  4. 4. Other changes are specific to each sex:  Girls develop breasts and their hips get wider.  Boys get deeper voices or get facial hair.
  5. 5. REPRODUCTIVE CELLS Reproductive cells carry out the funtion of reproduction. Sperm: are the male reproductive cells. They have a head and a long tail called flagellum. They are produced in large numbers from the time of puberty. Ova: are the female reproductive cells. They do not move. From puberty an ovum matures every month.
  6. 6. OVA SPERM
  7. 7. THE REPRODUCTIVE SYSTEMS . THE FEMALE REPRODUCTIVE SYSTEM:  Ovaries.  Uterus.  Fallopian tubes.  Vagina.  Vulva.
  8. 8. MALE REPRODUCTIVE SYSTEM  Testicles  Vas deferens  Urethra  Seminal vesicles  Prostate  Penis
  9. 9. FERTILISATION Fertilisation occurs when an ovum and a sperm join inside the fallopian tubes and they create a single cell called zygote. The zygote goes down the fallopian tubes, it is implanted in the wall of the uterus and it becomes an embryo.
  10. 10. PREGNANCY AND BIRTH PREGNANCY Pregnancy last about 9 months and ends in a birth. During the early stages, different structures are created to protect the embrio: The placenta. The umbilical cord. The amniotic sac.
  11. 11. The baby develops step by step:  After 3 months: the embryo has all its organs. It becomes a foetus.  After 5 months: the baby starts moving and the mother feels it.  After 9 months: the baby is ready to be born and it weighs around 3 kilos. LABOUR o Dilation. o Expultion. o Afterbirth.

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