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BIOLOGY
Topic 7 hormones
Hormones
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What are
hormones
?
Chemical
messengers that are carried in the blood!
What is
target organ
?
Organ affected by a specific
hormone
causing a change in what's it doing
6 things of
hormonal system
?
The
pituitary glands
Thyroid glands
The
adrenal glands
The
testes
The
pancreas
Ovaries
What does
pituitary glands
?
Makes glands and secretes hormones into blood to have effect on or other glands to make them produce hormones
What's released in thyroid glands?(neck)
Releases thyroxine and controls l heart rate, temperature and metabolic rate
What does pancreas contain
secretes insulin and glucagon and controls blood glucose levels
What does
ovaries
produce?
Produces sex hormones,
oestrogen
and
progesterone
What does adrenal glands release (above )
Several hormones including andrenelin
What does
testes
release?
Sex
hormones
, testerone
Endocrine system
Effects are produced
slower
that
nervous system
but last
longer
What is
homeostasis
Maintaining an optimal
internal
emvironment
How does
negative feedback
keep conditions at
optimum
levels in
homeostasis
?
Reduce level if too high and increase levels when it falls
What does
adrenaline
do?(
fight or flight
)
Affects how animal responds to danger
What produces
adrenaline
Adrenal glands
What increases for adrenaline?
Heart rate
breathing rate
and
blood pressure
increase
How do you have energy to fight or flight
Simulates
liver
and converts
glycerin
to
glucose
so more oxygen and glucose go to
brain
and muscles