The digestive system

• Cells


  The building blocks of all living organisms
• Tissue


  Group of cells that have similar functions and structure
• Organ


  Groups of tissues that work together to perform a specific function
• Organ system


  Groups of organs that work together to perform specific functions
• Mechanical digestion


  Physical breakdown of food by teeth grinding + stomach churning
• Chemical digestion


  Enzymes that break down the large food molecules
• Ingestion


  Taking the food into the mouth
• Digestion


  Breaking down large insoluble molecules into small soluble molecules
• Absorption


  Small molecules taken into the blood from the small intestine
• Assimilation


  Food molecules in the blood sent to the parts of the body that need it
• Egestion


  Undigested food + waste that is ejected from the body as faeces