Course Content
TRANSPORT IN PLANTS AND ANIMALS
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EXCRETION AND HOMEOSTASIS
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Biology Form 2
About Lesson

Introduction

Living things utilize nutrients and eliminate waste products.

Some of the common waste products include:

  • Carbon (IV) oxide
  • Excess water
  • Nitrogenous waste products
  • Mineral salts
  • Drugs
  • Hormones
  • Bile pigments

Terminology

  1. Excretion – is the process by which living organisms separate and eliminate metabolic waste products from their bodies.
  2. Homeostasis – is the maintenance of a constant state of the internal environment of the living organism in order to provide optimum conditions for body metabolism.
  3. Egestion – is the removal of undigested and indigestible food substances through the anus.
  4. Secretion – is the release of useful substances produced by cells; e.g. hormones, enzymes
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