Digested molecules of food, and water and minerals, are absorbed from the small intestine.
Most absorbed materials go into the blood and are carried off in the bloodstream to other parts of the body for storage or more chemical change.
The body's main energy source.
Sugars, starch, and fiber.
Made of carbon, hydrogen, and oxygen atoms.
Some of our most common foods contain mostly carbohydrates.
Provide fuel for the body
Examples are bread, potatoes, rice, spaghetti, fruits, and vegetables. Many of these foods contain both starch and fiber.
Made up of amino acids
is used for replacement and repair of body cells
has large molecules that contain carbon, hydrogen, oxygen, and nitrogen
found in meats, fish, and beans.
Must be digested by enzymes before they can be used to build and repair body tissues.
An enzyme in the stomach starts the digestion of protein.
Digestion of the protein is finished in the small intestine.
Several enzymes from the pancreas and the lining of the intestine continue the breakdown of huge protein molecules into small molecules called amino acids.
Amino acids can be absorbed from the small intestine into the blood and then be carried to all parts of the body to build the walls and other parts of cells.
Also called lipids.
Are necessary because they provide energy and help your body absorb vitamins.
Fat tissue cushions your internal organs.
A major part of every cell membrane is made up of fat.
The first step in digestion of a fat is to dissolve it into the watery contents of the intestine.
The bile combines with the fatty acids and cholesterol and help these molecules to move into the cells lining the intestine. In these cells the small molecules are made back into large molecules.
Most of the large molecules pass into blood vessels near the intestine. These small vessels carry the fat to the veins of the chest, and the blood carries the fat to storage depots in different parts of the body.
A vital part of our food that is absorbed from the small intestine.
Needed in small quantities for growth, regulating body functions, and preventing disease.
The two different types of vitamins are classified by the fluid in which they can be dissolved: water-soluble vitamins (all the B vitamins and vitamin C) and fat-soluble vitamins (vitamins A, D, and K).
Inorganic nutrients—nutrients that lack carbon
Regulate many chemical reactions in your body
Your body uses about 14 minerals.
Minerals build cells, take part in chemical reactions in cells, send nerve impulses throughout your body, and carry oxygen to body cells.
Most of the nutrients in your body can't be used unless they are carried in a solution. This means that they have to be dissolved in water.
In cells, chemical reactions take place in solutions.
Most of the material absorbed from the cavity of the small intestine is water in which salt is dissolved.
The salt and water come from the food and liquid we swallow and the juices secreted by the many digestive glands.
For more information about the digestive system, click here: http://kidshealth.org/kid/body/digest_noSW.html