Excretion is an essential process in living organisms that involves the removal of metabolic waste products to maintain a stable internal environment. This Form Three Biology PDF note provides clear explanations of excretion, egestion, and secretion, helping students understand their differences and roles in the body.
The material covers the importance of excretion, major excretory products such as carbon dioxide, urea, and uric acid, and how they are eliminated in both plants and animals. It also explains nitrogenous wastes, including ammonia, urea, and uric acid, along with their characteristics and examples.
In addition, the notes describe human excretory organs such as the kidneys, liver, lungs, and skin, and their specific functions. The urinary system and its components are also well outlined for better understanding and exam preparation.
Download the full PDF below to improve your understanding of excretion.
