Cold sores - painful sores on the lips and around the mouth, caused by a virus. Canker sores - painful sores in the mouth, caused by bacteria or viruses. Thrush - a yeast infection that causes white patches in your mouth. Leukoplakia - white patches of excess cell growth on the cheeks, gums or tongue, common in smokers.
Energy and Metabolism. All living organisms need energy to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is the set of life-sustaining chemical processes that enables organisms transform the chemical energy stored in molecules into energy that can be used for cellular processes.
Energy is a very important factor which aids the survival of all living organisms. Energy is produced when food is broken down by a process called metabolism. Metabolism is a set of chemical reactions which occur within the body's cells. The process begins when food is eaten, enzymes break down the food and once it has all been broken down, the compounds are then absorbed into the blood stream and are transported to different cells in the body.