Unit 4 human reproduction teresa s

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Unit 4 human reproduction teresa s

  1. 1. HUMAN REPRODUCTION BY TERESA ORTEGA FERNANDEZ
  2. 2. REPRODUCTION PRIMARY SEXSUAL CHARACTERISTICS The reproductive systems are the primary sexsual characteristics. We already have them when we are born and they are different for male and female.
  3. 3. SECONDARY SEXSUAL CHARACTERISTICS The external characteristics which differentiate men from women. 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 and get facial hair
  5. 5. REPRODUCTIVE CELLS Reproductive cells carry out the function of reproduction. Sperm: are the male reproductive cells. They are small. They have a head and a long tail called a flagellum. Ova: are the female reproductive cells. They do not move. From puberty ,an ovum matures every month.
  6. 6. REPRODUCTIVE CELLS
  7. 7. THE FEMALE REPRODUCTIVE SYSTEM Is made up of these organs: THE OVARIES. THE UTERUS. THE FALLOPIAN TUBES. THE VAGINA. THE VULVA.
  8. 8. THE MALE REPRODUCTIVE SYSTEM Is made up of these organs: THE TESTICLES. THE VAS DEFERENS. THE URETHRA THE SEMINAL VESICLES AND PROSTATE THE PENIS
  9. 9. FERTILISATION Fertilisation occurs when an ovum and a sperm join inside the Fallopian tubes and they create a single cell called a zygote. The zygote goes down the Fallopian tubes, it is implanted in the wall of the uterus and it is becomes and embryo.
  10. 10. PREGNANCY Different structures: THE PLACENTA. THE UMBILICAL CORD. THE AMNIOTIC SAC. LABOUR: Step by step: DILATION After 3 months. EXPULSION After 5 months. AFTER BIRTH After 9 months.

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