THe Human System (story)

The Digestion of Larry the Liver Sandwich

Larry, the Liver Sandwich, consists of lettuce, tomato, ketchup, butter, bread, onions, mayonnaise, and of course liver! Unfortunately, Larry is deliciously eaten by a human, and must be digested by the body so that the body can use the substances in the sandwich. The main nutrients found in the materials making up the sandwich are amino acids, found in the tomato and liver, carbohydrates, found in the onions and bread, water, found in the vegetables, lipids/fats, found in the butter and mayonnaise, and vitamins, found in all the vegetables. Dietary fiber is also found in some of the substances such as onions, lettuce, and bread. From the moment a human bites into the sandwich, the digestion process begins.
The food undergoes a form of mechanical digestion, in the mouth. The teeth of the human bite, and break down the food into smaller pieces. This is a form of mechanical digestion. Salivary glands in the mouth produce secretio...