Chemical digestion breaks food down into its simplest forms.
During digestion water is reabsorbed into the large intestine.
This segment reviews the basics of nutrients and digestion.
Digestion occurs in the digestive system, which has many parts. These parts form a long tube called the alimentary canal.
The food that we eat must be broken down into very small pieces for our cells to use. Nutrients are chemicals that our bodies need. Digestion breaks down the complex molecules into more simple molecules that the body can use.
The human body is made up of cells. Muscle cells, brain cells and all other cells require energy.
All human activities require energy, which comes from food. Food also supplies raw materials for growth and repair.
Get a close-up look at the digestive process in this investigation of the human digestive system.
Eating a balanced diet and exercising will keep a person healthy.
The large intestine absorbs lots of water from the digested food. All of the remaining material that the body can't use is waste. The waste collects and is eliminated as feces.
The nutrients in the digested food are absorbed through the wall of the small intestine.
