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The human body and reproduction


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The human body and reproduction

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The human body and reproduction

  1. 1. UNIT 3
  2. 2. 1. STAGES OF LIFE We pass through five stages in our live: Infancy Childhood Adolescence Adulthood Old Age The babies learn to do the most basic things. Children become autonomous. The reproductive system becomes mature. Boys and girls are ready to reproduce. VIDEO: Stages of life
  3. 3. Men and women have different sexual characteristics PRIMARY SEXUAL CHARACTERISTICS: Female and male reproductive systems are different. SECONDARY SEXUAL CHARACTERISTICS: During adolescence, boys and girls experience some changes in their bodies. Boys: deeper voice, facial hair… Girls: The breast develop, wider hips… VIDEO: Male and female reproductive system
  4. 4. 2. THE REPRODUCTIVE SYSTEMA) THE MALE REPRODUCTIVE SYSTEM The testicles produce the sperm. ( reproductive cells) They are protected by the scrotum. The vas deferens transport the sperm from the testicles to the urethra. The seminal vesicles are two glands. They produce seminal fluid. The urethra is conected to the vas deferens. The sperm travels through the urethra to the outside of the body. The penis is the most external part of the male reproductive system.
  5. 5. B) THE FEMALE REPRODUCTIVE SYSTEM The ovaries are two organs that produce and develop the eggs (reproductive cells). The Fallopian tubes connect the ovaries to the uterus. The uterus is a cavity with muscular walls The vagina connect the uterus with the outside of the body. The vulva is the external organ of the female reproductive system.
  6. 6. 3. SEX CELLS AND FERTILISATION  SEX CELLS Human reproduce sexually, the union of two different sex cells is necessary. The male reproductive system produces the male sex cells (sperm). The female reproductive system produces the female sex cells (ovum or egg) VIDEO: The human reproduction
  7. 7. SPERM Sperm begins to form in the testicles during puberty. Sperm are very small cells OVUM Girls are born with all their eggs. The eggs mature during puberty. Eggs are bigger than sperm.
  8. 8.  FERTILISATION Fertilisation is the fusion of an ovum and a sperm. 2. Sperm enters the female reproductive system and goes to the Fallopian tube. 1. Every 28 days an egg is released from the ovaries and is pushed along the Fallopian tube towards the uterus. 3. Sperm fertilises the egg. A zygote is formed. 4. The zygote divides and forms an embryo. 5. The embryo implants itself in the uterus, where it continues to grow and develop.
  9. 9. 4. PREGNANCY AND GIVING BIRTH  PREGNANCY Pregnancy lasts nine months. First trimester The baby`s brain begins to develop, the heart beats… At the end of the first trimester the organs are formed and begin to function… embryo Second trimester The foetus can hear, open and close its eyes… The mother can feel the baby moving. foetus Third trimester The foetus grows. The baby is ready to live outside the mother. baby
  10. 10. PLACENTA: It takes oxygen and nutrients from the mother`s blood. UMBILICAL CORD: It connects the placenta to the baby. Oxygen and nutrients are transported through the umbilical cord to the baby. AMNIOTIC SAC: It contains amniotic fluid. AMNIOTIC FLUID: It protects the baby VIDEO: Pregnancy
  11. 11.  GIVING BIRTH During dilation the area of the uterus that is connected to the vagina expands. Rhythmic contractions begin. These contractions push the baby. In the expulsion phase the baby is pushed out of the body Delivery is the last stage of the birth. The placenta is pushed out of the body.