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==Key Stage 4 Higher==
===Meaning===
[[AdrenalinAdrenaline]] is a [[hormone]] produced by the [[Adrenal Gland|adrenal glands]] which affects the [[Fight or Flight|fight or flight]] response of [[vertebrate]]s.
===About AdrenalinAdrenaline===[[AdrenalinAdrenaline]]'s effect on [[Target Organ|target organs]]:
*The [[heart]] is caused to beat faster.
*The [[bladder]] becomes irritating causing an [[organism]] to feel the need to urinate.
*The [[brain]] and [[Nervous System|nervous system]] increase the speed of [[Impulse (Biology)|electrical impulses]] giving shorter [[Reaction Time|reaction times]].