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GCSE - Biology - Homeostatis and Response
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Biology - Ecology
GCSE - Biology - Homeostatis and Response Flashcards | Quizlet
453 cards
Cards (552)
If the Thyroxine levels are too high then...
the
pituitary gland
releases
Thyroid Stimulating Hormone
Genetic testing raises
ethical issues
as it...
could lead to the selection of
preferred characteristics
IVF often results in...
unused embryos
which have to be
destroyed
Some women on IVF have a...
strong reaction
to the
hormones
so it is
physically challenging
What is the average success rate for IVF in the UK?
26%
FSH and LH are given
before
egg collection to...
increase egg production
do
more than one can
be
collected
Once the embryos are tiny balls of
cells...
one
or
two
of them are
transferred
into the
uterus
to improve he chances of
pregnancy
The fertilised egg is grown into an embryo in a...
laboratory incubator
What is the process called in which the sperm is injected directly into he egg if a mans sperm count is low?
Intra-Cytoplasmic Sperm Injection
IVF involves collecting eggs from the ovaries and fertilising them in a...
lab
with the
mans sperm
Cons of fertility drugs is that they are...
expensive
, not always
effective
and too many eggs could be released resulting in
unexpected twins
,
triplets
etc...
These hormones can be given to women as...
fertility drugs
to
stimulate ovulation
If women have FSH that are too low then...
no eggs
will
mature
What is the only way to make sure the
sperm
and egg never
meet
?
Abstinence
Natural Methods' involve finding out when...
the woman is most
fertile
and avoiding
sex
on these days (if people think
barrier
methods are
unnatural
)
Sterilisation in a man involves cutting or tying the...
sperm duct
Sterilisation in a woman involves cutting or tying the...
Fallopian tubes
Spermicide alone is only about...
70-80%
effective
It has to be used with a...
spermicide
to
kill sperm
A
diaphragm
is a small plastic cup that fits over the...
cervix
(barrier)
Condoms
are the only form of
contraception
that prevent...
STDs
because they act as a
barrier
Copper IUDs
prevent sperm from surviving in the uterus
Plastic IUDs...
release progesterone
An IUD is a T-shaped device inserted into the...
uterus
A contraceptive injection lasts...
2-3 months
An Implant lasts...
three years
The implant releases...
progesterone
The contraceptive implant is inserted under...
the
skin
of the
arm
Its stuck to the skin and lasts...
one week
The contraceptive patch contains...
oestrogen
and
progesterone
The pill contains
oestrogen
and
progesterone
but...
can cause
headaches
and
nausea
and doesn't protect against
STDs
(but is
99
% effective)
Progesterone reduces fertility
because it...
produces a
thick mucus
which prevents
sperm
getting through
Oestrogen can prevent the release of an egg because it...
inhibits
the production of
FSH
so
no
eggs
mature
Progesterone inhibits the release of...
FSH
and
LH
When the
progesterone
levels fall...
the
lining
breaks down
Progesterone maintains the ...
lining of the uterus
Progesterone is produced in the...
ovaries by the remains of the follicle
LH stimulates the release of...
an
egg
at day
14
LH is produced by the...
Pituitary Gland
Oestrogen stimulates the release of...?
LH
- which causes the
release
of the
egg
and
inhibits
the
release
of
FSH.
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