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By Maria
Toranzo Sesma
Primary sexual characteristics

• The reproductive system are the primary
 sexual characteristics.We already have
 them when we are born and they are
 different for male and female.
Secondary sexual
 characteristics
• The external characteristics which
 differentiate men from women are called
 secondary sexual characteristics.

• Girls develop breasts and their hips get
 wider.

• Boys get deeper voices.
Reproductive cells
• Sperm:are the male reproductive cells.They
  are small.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.
The female reproductive system

• The ovaries produce the ova.
• The uterus is where the baby develops.
• The Fallopian tubes connect the ovaries to
  the uterus.
• The vagina connects the uterus to the
  outside of the body.
• The vulva is the external part of the female
  reproductive system.
The female reproductive system
The male reproductive system

• The testicles are outside the body.
• The vas deferens take sperm from the
  testicles to the urethra.
• The urethra takes sperm outside the body.
• The seminal vesicles and prostate
  produce seminal fluid and send it t the
  urethra.
• The penis is outside the male reproductive
  system.
The male reproductive system
Fertilisation

• Fertilisation occurs when an ovum and a
 sperm joint 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.
Pregnancy
 Pregnancy lasts about 9 months and ends
  in a birth.
 During the early stages, different structures
  are created to protect the embryo.
• The placenta:takes nutrients and oxygen
  from the mother´s blood to the embryo.
• The umbilical cord:connects the embryo to
  the placenta.
• The amniotic sac protects the embryo.
Pregnancy

 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.
Pregnancy
Labour
 The process of giving birth is called
  labour.labour takes place in three phases:
• Dilation:rhythmic contractions make the
  opening of the vagina and vulva big
  enough for the baby to come out.
• Expulsion:the baby is born and the doctor
  cuts the umbilical cord.
• Afterbirth:the placenta comes out of the
  mother´s body.
Labour
Human reproduction by Maria

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Human reproduction by Maria

  • 2. Primary sexual characteristics • The reproductive system are the primary sexual characteristics.We already have them when we are born and they are different for male and female.
  • 3. Secondary sexual characteristics • The external characteristics which differentiate men from women are called secondary sexual characteristics. • Girls develop breasts and their hips get wider. • Boys get deeper voices.
  • 4. Reproductive cells • Sperm:are the male reproductive cells.They are small.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.
  • 5. The female reproductive system • The ovaries produce the ova. • The uterus is where the baby develops. • The Fallopian tubes connect the ovaries to the uterus. • The vagina connects the uterus to the outside of the body. • The vulva is the external part of the female reproductive system.
  • 7. The male reproductive system • The testicles are outside the body. • The vas deferens take sperm from the testicles to the urethra. • The urethra takes sperm outside the body. • The seminal vesicles and prostate produce seminal fluid and send it t the urethra. • The penis is outside the male reproductive system.
  • 9. Fertilisation • Fertilisation occurs when an ovum and a sperm joint 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. Pregnancy Pregnancy lasts about 9 months and ends in a birth. During the early stages, different structures are created to protect the embryo. • The placenta:takes nutrients and oxygen from the mother´s blood to the embryo. • The umbilical cord:connects the embryo to the placenta. • The amniotic sac protects the embryo.
  • 11. Pregnancy 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.
  • 13. Labour The process of giving birth is called labour.labour takes place in three phases: • Dilation:rhythmic contractions make the opening of the vagina and vulva big enough for the baby to come out. • Expulsion:the baby is born and the doctor cuts the umbilical cord. • Afterbirth:the placenta comes out of the mother´s body.