Chapter 45: Reproduction, Growth And Development

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Chapter 45: Reproduction, Growth And Development Powered By Docstoc
					Chapter 39: Reproduction,
Growth And Development

   By
   Mr. A. Rogan
Chapter 45: Reproduction,
Growth And Development
Introduction:
Male and female
 reproductive organs
 produce Sex cells
 (Gametes).
Chapter 45: Reproduction,
Growth And Development
Female  sex cell called the
 ovum or the egg.
Produced in the ovary
Ovum – 0.1 mm long
Chapter 45: Reproduction,
Growth And Development
Male  sex cells are Sperm.
Sperm are produced in
 the testis
Sperm – 0.01 mm long
Chapter 45: Reproduction,
Growth And Development
Zygote  – When an egg
 and a sperm fuse they
 form a zygote.
Zygotes develop into a
 new individual.
Chapter 45: Reproduction,
Growth And Development
Fertilisation:
Fertilisationis the fusion
 (joining together) of an
 egg cell with a sperm cell.
Chapter 45: Reproduction,
Growth And Development
Chapter 45: Reproduction,
Growth And Development
Chapter 45: Reproduction,
Growth And Development
 Male Reproductive
  Parts:
 Sperm Duct
 Penis
 Testis
 Scrotum
 Prostrate Gland
 Urethra
Chapter 45: Reproduction,
Growth And Development
Sperm    Duct:
Carries Sperm from testis to
 urethra
Penis:
Releases sperm and passes
 into the vagina
Chapter 45: Reproduction,
Growth And Development
Testis:
Produces  sperm and
 testosterone.
Scrotum:
Holds the testes and keeps
 them at the right
 temperature.
Chapter 45: Reproduction,
Growth And Development
Prostrate  Gland:
Secretes fluid which help sperm
 to swim – Semen.
Urethra:
Carries sperm during
 intercourse and urine during
 excretion.
Chapter 45: Reproduction,
Growth And Development.
Chapter 45: Reproduction,
Growth And Development
Female   Reproductive Parts:
Ovary
Neck  of womb
Fallopian tube
Womb
Vagina
Chapter 45: Reproduction,
Growth And Development
Ovary:
Produces   eggs and
 oestrogen
Neck of womb:
Cervix- entrance to the
 womb
Chapter 45: Reproduction,
Growth And Development
Fallopian  Tube:
Carries the egg from the
 ovary to the womb
Womb:
Uterus – hold developing
 embryo
Chapter 45: Reproduction,
Growth And Development
Vagina:
Holds   the penis during
 intercourse.
It is the birth canal, down
 which the baby passes.
Chapter 45: Reproduction,
Growth And Development
Puberty:
10 – 15 years
Changes to body
Caused by hormones (body
 chemicals)
Now physically capable of
 having a baby.
Chapter 45: Reproduction,
Growth And Development
Changes   To Body:
Male:
Voice Deepening
Underarm hair
Facial Hair
Sperm Production
Pubic Hair
Chapter 45: Reproduction,
Growth And Development
Changes    To Body:
Female:
Underarm   Hair
Breasts Develop
Widening Of Hips
Pubic Hair
Chapter 45: Reproduction,
Growth And Development
Menstrual  Cycle:
1 egg released from an
 ovary once a month –
 Ovulation.
Egg travels to the uterus
Chapter 45: Reproduction,
Growth And Development
Menstrual     Cycle:
The uterus wall becomes
 thick and rich in blood
 vessels.
If unfertilized, the egg
 passes out via the vagina.
Chapter 45: Reproduction,
Growth And Development
Menstrual   Cycle:
Menstruation – The uterus
 wall is now not needed so
 it breaks down and is also
 shed
Chapter 45: Reproduction,
Growth And Development
Menstrual   Cycle:
This occurs once a month
 unless the egg is fertilised.
After 45 – 50 years of age,
 no more eggs are produced
 – Menopause.
Chapter 45: Reproduction,
Growth And Development
Intercourse:
200,000,000   sperm
 released from a stiff, erect
 penis into woman's vagina
 (near cervix) – copulation.
Chapter 45: Reproduction,
Growth And Development
Fertilisation:
Sperm     swim through cervix,
 up the uterus into the
 fallopian tubes.
If an egg is present
 fertilisation may occur.
Chapter 45: Reproduction,
Growth And Development
Even  if no egg is present,
 sperm may live for 2 – 3
 days in the woman's body.
Egg may live for 24 hours.
Chapter 45: Reproduction,
Growth And Development
Development   Of
 Foetus:
Sperm + Egg =
 Zygote
Zygote divides
 many times to form
 ball of cells.
Chapter 45: Reproduction,
Growth And Development
It travels to the womb.
The ball of cells (embryo)
 sticks to and sinks into the
 womb wall (full of blood
 vessels) – nourishment.
Implantation.
Chapter 45: Reproduction,
Growth And Development
The
 embryo
 develops
 for 40
 weeks in
 the womb.
Chapter 45: Reproduction,
Growth And Development
Chapter 45: Reproduction,
Growth And Development
Family  Planning:
Limiting and spacing
 the number of children
 a couple have.
Chapter 45: Reproduction,
Growth And Development
How?
By  using contraception:
Natural Methods – avoid
 intercourse around
 ovulation.
Chapter 45: Reproduction,
Growth And Development
Artificial
          Methods
The pill – prevents
 ovulation
Condoms – Prevent
 sperm from reaching the
 egg

				
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