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← Human Biology notes
Edexcel IGCSE·Human Biology·IGCSE Human Biology

Hormones & Coordination

11 min read

The endocrine system, key hormones, and a comparison of nervous and hormonal control.

The endocrine system

Hormones are chemicals made by glands and carried in the blood to target organs. Key examples:

  • Insulin/glucagon (pancreas) — blood glucose.
  • Adrenaline (adrenal glands) — "fight or flight": raises heart rate and blood glucose.
  • Oestrogen/testosterone — sexual development and reproduction.
  • ADH (pituitary) — water balance.

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