The Digestive System

• Cells are basic building blocks of all living organisms

• A tissue is a group of cells with a similiar structure and function (job)

• Organs are a group of tissues that together have a specific function 

Organs are organised into Organ systems, which work together to form Organisms

The Digestive System is one example of a system in which humans and other mammals exchange substances with the enviroment.

• Catalysts increase the rate of chemical reactions
• Enzymes are biological catalysts
• Different enzymes are produced and work in different parts of the digestive system
• These enzymes catalyse the breakdown of large insoluble molecules in our food into smaller soluble molecules. 
• These are then able to be absorbed throught the wall of the small intestine and then they dissolve in our blood and carried around the body