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Quiz yourself on Hormones & BehaviourGet your flashcardsBuild my revision planTrack my progressAdrenaline and Thyroxine: Two Hormones, Two Timescales
This topic focuses on two specific hormones that illustrate how the endocrine system can operate on very different timescales:
- Adrenaline (from the adrenal glands, above the kidneys) — acts within seconds, triggers dramatic physical changes, and is broken down quickly once the threat passes.
- Thyroxine (from the thyroid gland, in the neck) — acts over hours, days, and years to regulate the baseline speed of metabolism throughout the body.
Both are studied as key examples of hormonal control. For the full overview of all endocrine glands and the general endocrine system, see Topic 4: The Human Endocrine System.
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