Acts as a barrier to
prevent sperm
entering the
woman
Easily obtained and also protects against STD's
Unreliable if not used properly
Chemical
Contraceptive pill
Taken regularly by the
woman and prevents the
ovaries from releasing eggs
by changing hormone levels
Very reliable
Side effects like weight
gain and can increase
the risk of blood clots
Surgical
Vasectomy
Cutting of sperm
tubes preventing
sperm from
entering penis
Female sterilisation
Cutting of the oviduct
preventing the ova
from moving through
the oviduct and being
fertilised
Irreversible
!00% reliable
Natural
Avoid having sex around
the time when the woman
releases an ovum each
month
The sperm and eggs
Sperm is much
smaller than the egg
and has the adaption
of a tail for ease of
mobility new sperm is
produced continually,
the eggs are in the
female system from
birth but aren't
released until puberty
These gametes
are formed by
meosis
The gametes have
the haploid number
(23 chromosomes)
Sperm is
the male sex
cell it is
produced in
the testes
Sperm is
produced under
the influence of
the hormone
testosterone
Eggs the female
sex cell are
produced in the
ovaries
Eggs are produced under
the influence of oestrogen
Fertilisation,
pregnancy &
development of
the baby
The production of new living organisms by
combining genetic information from two
individuals of different sexes
The sperm and eggs meet and fuse in
an oviduct, restoring the diploid number.
the fertilized egg becomes the first cell
This cell then divides by mitosis and
grows into a ball of cells as it travels
down the oviduct, the ball of cells becomes
an embryo which implants itself into the
wall of the uterus
The uterus develops a thick lining that holds and nourishes the embryo. The placenta and umbilical cord
also form. A protective membrane, the amniotic sac, it contains amniotic fluid, within which the growing
embryo develops. This cushions the delicate developing embryo
The baby cannot breathe in the
amniotic fluid so during pregnancy
useful materials like oxygen and
glucose pass from the mother.
Waste excretory materials pass
from the foetus back to the mother
The boundary
between
maternal blood
and foetal blood
The systems are not joined but are close
together and separated by thin membranes
to allow diffusion of gases and nutrients.
the large surface area between the uterus
wall and the placenta helps diffusion of
materials between mother and foetus
Umbilical cord
umbilical artery:
carries urea,
carbon dioxide
and other wastes
back to the
mother
umbilical vein:
carries oxygen,
glucose, amino acids
and other nutrients
from the mother to
the foetus
Placenta
Very rich in maternal
blood vessels;
mother's blood is rich
in oxygen and other
nutruents
Puberty
Males
Facial and body hair
Pubic hair grows
Body
becomes
more
muscular
Voice deepens
Genitals
enlarge
Sexual
awareness
and drive
increase
Females
Pubic
hair
gorws
Hair grows in armpits
Sexual
organs
enlarge
Breasts develop
Pelvis and hips widen
Menstruation begins
Sexual
awareness
and drive
increase
Menstruation
Occurs in females from puberty until
the end of reproductive life, the
purpose of the menstrual cycle is to
prepare the reproductive system for
pregnancy by controlling the monthly
release of an egg and renewing and
replacing the uterine lining.
The cycle is controlled by female
hormones. the cycle is usually 28
days long. the cycle begins with
menstruation days 1-5, this is when
the blood-rich uterine lining breaks
down and is passed out of the body.
The uterine lining repairs itself & builds up again in
preparation for if implantation occurs days 6-13
Day 14 is ovulation -
an egg is released, by
this time the lining
has been fully
repaired and ready
for pregnancy, if
implantation and
pregnancy occur an
embryo will start to
develop and a
placenta forms, if not
the uterine wall
continues to thicken
until day 28
Fertility Problems
Treatments
Fertility Drugs
These are given to
the woman to
increase the
production of eggs
In vitro fertilisation
The woman is given
fertility drugs and
eggs are then
collected from her
ovaries surgically.
sperm is donated and
the sperm and the
eggs are mixed in the
laboratory. successful
embryos are placed
into the mother's
uterus in hope that
the embryo will
implant itself in to
the uterine lining