8 Premolars - teeth with several cutting edges for shredding. 12 Molars - teeth with a flat surface for grinding. Pulp - the cavity containing blood vessels and nerves. Cementum - binds the enamel to the dentine. Chemical digestion breaks complex chemicals into simple ones.
Chemical digestion begins in the mouth and continues in the stomach.
Dietitian Food contains nutrients , molecules that provide energy and material for growth. Teenagers should be concerned about good nutrition . The chemical composition of your body includes most elements found in the earth's crust. Carbohydrates - compounds composed of carbon, hydrogen, and oxygen. These substances are fairly easily broken down and provide most of the body's energy for cellular respiration.