Human reproduction by Aadriana Elena Zahira and Rebeca

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Human reproduction by Aadriana Elena Zahira and Rebeca

  1. 1. PRYMARY SEXUALCHARACTERISTICSThe reproductive systems are the primary sexual characteristics . We are alredy have them when we are born and they are different for male and female
  2. 2. SECONDARY SEXUALCHARACTERISTICSThe external characteristics which differentiate men from woman are called secondary sexual characteristics. During puberty , between the ages of eleven and fifteen , the reproductive systems matures . Other changes are specific to each sex :*Girls develop breasts and their hips get wider.*Boys get deeper voices.
  3. 3. REPRODUCTIVE CELLS Reproductive cells carry out the funtion of reproduction *Sperm are the male reproductive cells.They are small.They have head and a long tail called a flagellum.They are produced in large numbers from the time of the puberty. *Ova are the female reproductive cells.They do not move.From puberty,an ovum matures every month.
  4. 4. THE REPRODUCTIVE SYSTEMThe female reproductive system -The ovaries -The uterus -The fallopian tubes -The vagina -The vulva
  5. 5. THE REPRODUCTIVE SYSTEMSThe male reproductive system:-The testicles-The vas deferens-The urethra-The seminal vesicles and prostate-The penis
  6. 6. FERTILISATIONFertilisation occurs when an ovum and a sperm join inside the fallopian tubes and they create 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.
  7. 7. PREGNANCY AND BIRTHPregnancy lasts about 9 months and ends in a birth. During the early stages, different structures are created to protect the embryo. *The placenta *The umbilical cord *The amniotic sac
  8. 8. AFTER... The baby develops step by step:*After 3 months:the embryo has all its organs.It becomes a foetus.* After 5 months:the baby´s body develops and it starts moving and the mother feels it.*After 9 months:the baby is ready to be born and it weighs around 3 kilos.
  9. 9. LABOURThe process of giving birth is called labour. Labour takes place in three phases:*DILATION : rhythmic contractions makethe opening of the vagina and vulva big enough for the baby to come out.*EXPULSION : The baby is born and the doctors cut the umbilical cord.*AFTERBIRTH : the placenta comes out of the mother’s body.

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