Noradrenaline; chemical which is excitatory - similar to adrenaline - and affects arousal and memory; raises blood pressure by causing blood vessels to become constricted - but also carried by bloodstream to the anterior pituitary which relaxes ACTH

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1. Noradrenaline; chemical which is excitatory - similar to adrenaline - and affects arousal and memory; raises blood pressure by causing blood vessels to become constricted - but also carried by bloodstream to the anterior pituitary which relaxes ACTH