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Paper 2
Homeostasis and Response
Contraceptives
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Fertility
can be controlled by a variety of
hormonal
and
non-hormonal
methods of
contraception
Oral contraceptives
contain
hormones
to
inhibit FSH production
so that no
eggs mature
Injections
,
implants
or
skin patches
slowly release
progesterone
to inhibit the
maturation
and release of
eggs
for a number of
months
or
years
Barrier methods such as
condoms
and
diaphragms
prevent the
sperm
reaching an
egg
and
sexually transmitted diseases
Spermicidal agents
kill
or
disable
sperm
Abstaining
from
intercourse
when an
egg
may be in the
oviduct
is not a
reliable
form of
contraception
Sterilisation
involves
cutting
or
tying
the
fallopian tubes
or the
sperm duct
Abstinence
is the most
reliable
way to
avoid pregnancy
Giving
FSH
and
LH
in a
‘fertility drug’
to a woman can cause her to become
pregnant
in the
normal
way
Intrauterine devices
(
IUDs
) are a
long-acting reversible contraceptive method
that is inserted into the
uterus.
In
Vitro Fertilisation
(IVF) treatment
IVF involves giving a mother
FSH
and
LH
to stimulate the
maturation
of several
eggs
The eggs are
collected
from the mother and
fertilised
by
sperm
from the father in the
laboratory
The
fertilised
eggs develop into
embryos
At the stage when they are
tiny balls
of
cells
, one or two embryos are inserted into the mother’s
uterus
(womb)
Although
fertility treatment
gives a woman the chance to have a
baby
of her
own
It is very
emotionally
and
physically stressful
The
success rates
are not
high
It can lead to
multiple births
which are a
risk
to
both
the
babies
and the
mother