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This lesson covers two important hormones in the Edexcel GCSE Biology specification: adrenaline and thyroxine. You will learn how adrenaline prepares the body for a fight or flight response, and how thyroxine controls your metabolic rate through a classic example of negative feedback.
Adrenaline is a hormone produced by the adrenal glands, which are located on top of each kidney. Adrenaline is released in response to fear, stress, or excitement — situations where the body needs to react quickly.
Adrenaline is released when the brain perceives a threat or a stressful situation. This triggers the fight or flight response — a set of rapid physiological changes that prepare the body to either confront the danger or escape from it.
Examples of situations that trigger adrenaline release:
Adrenaline causes a wide range of changes that prepare the body for intense physical activity:
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