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Biology
Reproduction in humans
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Created by
Gracie Holder
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Cards (20)
Oestrogen
female reproductive hormone
Progesterone
female
reproductive hormone
testosterone
male reproductive
hormone
Foetus
8 week
old embryo with all it's organs
Placenta
the organ where exchange of nutrients and oxygen happens between the mother and the baby
testes
produce
sperm
sperm ducts
carry sperm from testes to urethra
sperm
mixed with secretion from
glands
to make semen
egg
released from
ovaries
once a month, egg travels along
fallopian
tube to
uterus
egg
survives
24hrs
of ovulation
sperm
survives up to
five
days of
ovulation
released
egg
settles into the lining, if it isn't fertilized, a
period
happens
if an egg is fertilized it continuously divides into cells and differentiates. Some form structures in
embryo
, some in
placenta
umbilical cord
where nutrients from mother in
placenta
are transferred to the baby.
ovaries
release 2 hormones
oestrogen
,
progesterone
oestrogen
purpose
causes
uterine lining
to thicken and the
egg
to mature
progesterone
levels rise when
egg
is released, if
pregnancy
doesn't occur, levels decrease. Causes
uterine
lining to break down.
Oxygen
and nutrients diffuse across
placenta
Foetus -> mother – CO2, Urea, hormones
amniotic sack
surrounds
foetus
, filled with
amniotic fluid
, protects foetus by absorbing shock
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