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Puberty and the Menstrual Cycle (stages of the menstrual cycle (stage 1 -…
Puberty and the Menstrual Cycle
at
puberty
your body starts releasing
sex hormones
that trigger off
secondary sexual characteristics
in
men
the main reproductive hormone is
testosterone
which is produced in the
testes
and stimulates
sperm production
in
women
the main reproductive hormone is
oestrogen
which is produced by the
ovaries
and is involved in the
menstrual cycle
stages
of the
menstrual cycle
stage 1
-
menstruation starts
as the
uterus lining breaks down
for around four days
stage 2
-
the uterus lining build up
again into a thick spongy layer full of blood vessels, ready to
receive a fertilised egg
, from day
4-14
stage 3
- an egg develops and is released from the ovary, this is called
ovulation
, at day
14
stage 4
- the
wall is maintained
from abut days 1
4 until 28
, if
no fertilised egg
has landed on the uterus wall
by day 28
the uterus lining
starts to break down
and the whole
cycle starts again
hormones
in the
menstrual cycle
FSH
produced in the
pituitary gland
causes an
egg to mature
in one of the ovaries in a
follicle
stimulates
the
ovaries
to produce
oestrogen
Oestogen
produce in the
ovaries
causes the
lining
of the
uterus
to
grow
stimulates
the release of
LH
and
inhibits
the release of
FSH
LH
produced by the
pituitary gland
stimulates
ovulation
at day
14
progesterone
produced in the
ovaries
by the remains of the
follicle
after ovulation
maintains
the lining of the uterus in the
second part
of the cycle
inhibit
s the release of
LH
and
FSH