Biology » 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  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.



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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