GCSE Biology (AQA)

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Hormones & Glands

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Homeostasis and Response Hormonal Coordination in Humans

Hormones & Glands

1:56 Human Endocrine System
Spec 4.5.3.1
Previous Thermoregulation in Context Next The Endocrine System
  • Hormones are chemical messengers that travel through the blood.
  • They control various processes in the body including growth, sleep, and heart rate.
  • Hormones are not limited to reproductive functions but include many other types.
  • Hormones act on specific organs; for example, adrenaline affects the heart.
  • In a dangerous situation, such as encountering a lion, hormones like adrenaline are released.
  • Adrenaline increases heart rate, which helps supply more oxygen and glucose to muscles, aiding in faster movement.
  • Hormones are produced by glands, specifically endocrine glands.
  • The adrenal glands, located on top of the kidneys, produce adrenaline.
  • The organ on which a hormone acts is called the target organ; for adrenaline, it is the heart.

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