However, the overall effect of adrenaline is to prepare the body for the ‘fight or flight’ response in times of stress, i.e. What are the actions of adrenaline?Īdrenaline has many different actions depending on the type of cells it is acting upon. They are released into the bloodstream and serve as chemical mediators (hormone), and also convey the nerve impulses to various organs (neurotransmitters). They are produced in the centre ( medulla) of the adrenal glands and noradrenaline is also produced in some nerve cells ( neurons) of the central peripheral nervous system. Image of an eye showing a dilated or enlarged pupil - one of the effects of adrenaline released during a 'fight or flight' response.Īdrenaline and noradrenaline are two separate but related chemical messengers.
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