1 - STRUCTURES AND FUNCTIONS IN LIVING ORGANISMS

Levels of organisation - 

1. Similar cells -> tissues 
2. Tissues -> organs 
3. Organs -> organ systems 

1. Similar cells are organised into tissues 

• Tissue - group of similar cells that work together to carry out a particular function 
• eg: plants - xylem tissue (transporting water and mineral salts) and phloem tissue (transporting sucrose and amino acids) 
• Can contain more than one cell type 

2. Tissues are organised into organs 

• Organ - group of different tissues that work together to perform a function 
• eg: lungs in mammals, leaves (both made up of different tissue types) 

3. Organs make up organ systems 

• Each system does different job 
• eg: digestive system - stomach, intestines, pancreas, liver