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Topic 7
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Homeostasis
Constant maintenance
of
internal conditions
to maintain
optimal conditions
for
cellular reactions
Thyroxine
produced in
thyroid
gland
Insulin
and
glucagon
produced in the
pancreas
(behind
stomach)
barrier
advantage :
no
side
effects
,
protects
from
sexually
transmitted
infections
hormone
contraception's
advantage :
don't
need to
worry
while having
sex
, more
effective
to
prevent
pregnancy
FSH
causes
follicle
to
mature
and stimulates
oestrogen
Oestrogen
causes
uterus lining
to
build up
,
inhibits FSH
and stimulates
LH
,
LH
causes
ovulation
Progesterone
is produced in the
corpus luteum
, maintains
uterus lining
and inhibits
FSH
and
LH
FSH
and
LH
produced in the
pituitary
gland
Oestrogen
produced in the
follicle
or
ovaries
Type
1 is when
pancreas
doesn’t produce enough
insulin
Type
2
is when the
cells
stop
responding to
insulin
Glucagon is produced (glucose low) and causes liver to break down glycogen into glucose
If
not
enough
glucose
blood cells
lyse
(
explode
)
cells
crenate
(shrivel) if
too
much
glucose
Adrenalin increases
heart
rate and
breathing
rate
Negative feedback
is the form of control where
change
in a
condition
causes the
opposite
change to happen
Kidney
is part of
urinary
system and helps with
Osmoregulation
Nephrons
is the
filtration
unit
In the
Proximal
convoluted
tubule
reabsorption
of
useful
substances takes place
Water is
low
in the blood then
ADH
is
secreted
and
collecting
duct is more
permeable
Ovulation
is the
release
of an
egg
from the
ovary