Hormonal coordination

Hormonal coordination

Key Words

Hormones – chemical molecules released directly into the blood. They control things in organs and cells that need constant adjustment. They react slowly, for a long time and in a general way.

Glands – where hormones are produced.

Endocrine system – the group of glands in our body.

Nerves – connections to our nervous system. They react fast, for a short time and in a precise area.

Diabetes – a condition that affects your ability to control your blood sugar level.

Puberty – the body starts releasing sex hormones which trigger changes in the body.

Menstual cycle – 28 day cycle where┬á an egg is released in the human female reproductive system. Controlled by the hormones:

  • Follicle-Stimulating Hormone (FSH)
  • Oestrogen
  • Luteinising Hormone (LH)
  • Progesterone

Pregnancy – when a sperm reaches an ovulated egg.

Contraception – stops the sperm reaching an ovulated egg.

IVF – fertilising and egg with sperm in a lab.

Fertility – the natural capability of being able to produce children.

Adrenaline – a hormone realeased by the adrenal glands in response to stressful or scary situations.

Thyroxine – a hormone released by the thyroid gland that regulates the basal metabolic rate.

Basal metabolic rate – the speed at which chemical reactions in the body occur while the body is at rest.

Auxin – a plant hormone that controls growth near the tips of shoots and roots.

Gibberellin – a plant hormone that stimulates seed germination, stem growth and flowering.

Ethene – a gas produced by aging parts of a plant. It influences the growth of a plant and stimulates enzymes that cause fruit to ripen.


Also see Homeostasis, Reproduction

Growth of seedlings

Watch the video and have a go at writing out the steps of the practical.

Note paper for practical

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