BIOLOGY SSS 2 FIRST TERM

WEEK EIGHT

EXCRETION

PERFORMANCE OBJECTIVE

Students should be able to ;

1. Identify and describe different types of excretory systems in plants and animal
2. Explain the mechanism of some of the excretory organs and relate structures to function

CONTENT

Excretion

Excretion is the process of removing wastes and excess water from the body. It is one of the major ways the body maintains homeostasis. Although the kidneys are the main organs of excretion, several other organs also excrete wastes. They include the large intestine, liver, skin, and lungs. All of these organs of excretion, along with the kidneys, make up the excretory system.

The excretory system consists of several organs and structures that may have different features depending on the animal species. Its main function is to eliminate by filtration waste products resulting from cellular metabolism or incorporated from the environment, for example, during feeding, salt excess in seabirds, etcetera..... View More