Do now!
Can you read through
the word lists for this
topic please?
He’s going
to blow!
Be careful
Neutral
Good
Excellent
MOODOMETER
The Menstrual Cycle
What can you
remember?
TRUE or FALSE?
A woman normally has a period every 23
days
TRUE or FALSE?
A woman normally has a period every 23
days
It is normally every
28 days
TRUE or FALSE?
Menstruation is the name for when the egg
is released from the ovary
¡Estoy
libre!
TRUE or FALSE?
Menstruation is the name for when the egg
is released from the ovary
This is called
OVULATION
TRUE or FALSE?
If sperm are present the egg is normally
fertilised in the oviduct
TRUE or FALSE?
If sperm is present the egg is normally
fertilised in the oviduct
TRUE or FALSE?
A woman stops producing eggs between the
ages of 45 and 55. This is called
menstruation.
TRUE or FALSE?
A woman stops producing eggs between the
ages of 45 and 55. This is called
menstruation.
This is called
the
MENOPAUSE
TRUE or FALSE?
An egg is released roughly halfway between
periods (after about 14 days)
TRUE or FALSE?
An egg is released roughly halfway between
periods (after about 14 days)
Menstrual Cycle 2
Can you complete the sheet “Menstrual
Cycle 2”?
The rest of today’s lesson (and
tomorrow!)
• Know how a fertilised egg develops into an
embryo
• Know about implantation
• Know how the developing baby is protected
• Know how the developing baby is supplied
with food and oxygen and how waste is
taken away.
• Know how long pregnancy lasts
Sexual reproduction
Sexual reproduction
• Requires two parents, a male and female.
Sexual reproduction
• Both have sex organs
Sexual reproduction
• The sex organs make sex cells
Sexual reproduction
• In male animals the sex cells are called
sperm, made in sex organs called testes
(testis is singular)
I can stay alive in the
vagina for up to 3
days waiting for an
egg to be released.
Sexual reproduction
• In female animals the sex cells are called
eggs, made in sex organs called ovaries.
An egg is released
from the ovaries about
every 28 days. This is
called ovulation.
Sexual reproduction
• During sexual reproduction the sperm and egg
join together (fertilisation)
Sexual reproduction
• A fertilised egg is produced.
Sexual reproduction
• The egg cell begins to divide forming a ball
of cells.
Stem cells – have
the potential to
become any type of
cell
Sexual reproduction
• It may take several days to reach the uterus
and be implanted in the soft lining. It is now
an embryo.
Sexual reproduction
• Finger–like projections grow into the uterus
forming a plate like structure called the
placenta.
After 8 weeks I am
called a fetus.
Sexual reproduction
• The umbilical cord joins the fetus to the
placenta.
The placenta
• In the placenta food and oxygen diffuse
from the mother’s blood to the fetus’ blood,
and carbon dioxide and waste products
diffuse the other way.
The placenta
• In the placenta the blood of the fetus flows
close to the blood of the mother, but they do
not mix.
Why?
The placenta
• In the placenta the blood of the fetus flows
close to the blood of the mother, but they do
not mix.
• The mother’s blood under higher pressure
would burst the vessels in the developing
fetus.
• They may have different blood types.
Amnion
• The fetus is surrounded by a fluid-filled sac
(amnion) filled with amnionic fluid. This
protects the baby.
Week 8
• Baby's spinal column are beginning to form
around week 5
• Heart is beating
• Lungs are formed
• Eyes and ears are developing
• All internal organs are in
place by week 8
• Genital organs are visible
Week 12
• Inner ear, external ears, eyes,
mouth and nose are developing
• Heart is pumping blood
to all parts of the body
Week 16
•
•
•
•
Baby is now completely formed
From now on, growth will be rapid
Heartbeat can be heard with ultrasound
Baby's weight has more than doubled from week
15 to week 16
• Baby is moving quite vigorously
Week 20
•
•
•
•
•
Baby is covered in fine hair
Muscles are developing rapidly
Teeth are beginning to form
Hair is growing on baby's head
Baby is very active
Week 24
• Baby can suck its thumb
• Baby can hiccup and cough
• Baby weighs just over 1 pound
With special care I could
survive if born now
Week 28
•
•
•
•
Vernix coats the baby's skin
Baby's lungs are mature
Fat is starting to accumulate
Baby weighs approximately
2 pounds
Week 32
• Most babies are in the head
down position
• Baby weighs
approximately 3.5 pounds
Week 36
• Baby continues
to gain weight
• The irises of the eyes
are now blue
• Baby weighs
approximately 5 pounds
Week 40
• Most of the vernix on
the baby is gone
• Baby's eyes are open
and it can distinguish light
Time to leave!
The big questions
• When does new life begin?
• When is it a person?
• When is it alive?
Can you
complete the
sheets
“Pregnancy” and
“The Developing
Fetus”
Can you then try
reading pages 27
and 28?