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Hormones…read more

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How hormones work
Long lasting- aren't broken down by neurotransmitters
Widespread- transported all over body, depending on where target cells are
Slow- not released directly onto cells, have to travel in the blood to get there
secrete hormones e.g. pancreas secretes insulin
stimulated by change in concentration of a substance (e.g. another hormone) or by
electrical impulses
Chemical messengers
Travel in bloodstream
Will only bind to specific receptors found on 'target cell' membranes
trigger a response in target cells
Stimulus--> Receptor--> Hormone--> Effector--> Response…read more

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Thyroid hormones
The thyroid hormones, thyroxine (T4)
and triiodothyronine (T3), are tyrosine-
based hormones produced by the
thyroid gland primarily responsible for
regulation of metabolism…read more

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Adrenaline is a hormone produced by
the adrenal glands during high stress or
exciting situations.
This powerful hormone is part of the
human body's acute stress response
system, also called the "fight or flight"
It works by stimulating the heart rate,
contracting blood vessels (to the
digestive system), and dilating air
passages, all of which work to increase
blood flow to the muscles and oxygen
to the lungs.
Used as a medical treatment for some
potentially life-threatening conditions
including anaphylactic shock.…read more

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Noradrenaline (norepinephrine)
tartrate is a substance released
naturally by the nerve cells. It
produces wide ranging effects on
many areas of the body and is often
referred to as a 'fight or flight'
chemical, as it is responsible for the
body's reaction to stressful situations.
Noradrenaline normally produces
effects such as increased heart rate,
increased blood pressure, dilation of
pupils, dilation of air passages in the
lungs and narrowing of blood vessels
in non-essential organs. This enables
the body to perform well in stressful
Used in sudden life threatening low
blood pressure (acute hypotension)…read more

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