LEVELS OF ORGANISATIONS

Year 8 Science

Types of tissues:

epithelial, connective, muscle, nervous

Functions of organ systems:

e.g., circulatory system (transport nutrients and oxygen), respiratory system (gas exchange)

Levels of Organisation:

The hierarchical structure of biological organization in living organisms, which includes cells, tissues, organs, organ systems, and organisms.

Cell:

The basic unit of life, which can perform all life processes.

Tissue: A group of similar cells that work together to perform a specific function.

Organ: A structure composed of different types of tissues that work together to perform a specific function.

Organ System: A group of organs that work together to perform complex functions for the organism.

Organism: A complete living entity that can function independently.

Examples of specialized cells: red blood cells (transport oxygen), neurons (transmit signals), epithelial cells (cover surfaces)