chapter 39: reproduction, growth and development by mr. a. rogan
TRANSCRIPT
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 ovaryOvum – 0.1 mm long
Chapter 45: Reproduction, Growth And Development
Male sex cells are Sperm.Sperm are produced in
the testisSperm – 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:Fertilisation is the fusion
(joining together) of an egg cell with a sperm cell.
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
urethraPenis: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 DevelopmentProstrate Gland:Secretes fluid which help sperm
to swim – Semen.Urethra:Carries sperm during intercourse
and urine during excretion.
Chapter 45: Reproduction, Growth And DevelopmentFemale Reproductive Parts:OvaryNeck of wombFallopian tubeWombVagina
Chapter 45: Reproduction, Growth And Development
Ovary:Produces eggs and
oestrogenNeck of womb:Cervix- entrance to the
womb
Chapter 45: Reproduction, Growth And Development
Fallopian Tube:Carries the egg from the
ovary to the wombWomb: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 DevelopmentPuberty:10 – 15 yearsChanges to bodyCaused by hormones (body
chemicals)Now physically capable of having
a baby.
Chapter 45: Reproduction, Growth And DevelopmentChanges To Body:Male:Voice DeepeningUnderarm hairFacial HairSperm ProductionPubic Hair
Chapter 45: Reproduction, Growth And Development
Changes To Body:Female:Underarm HairBreasts DevelopWidening Of HipsPubic 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 DevelopmentDevelopment Of
Foetus:Sperm + Egg =
ZygoteZygote 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
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.