C.5.1

Define vitamin.
 * Vitamins** are organic substances in food that are needed by humans in very small amounts for growth, maintaining good health, and preventing disorders of metabolism. They are divided into water-soluble and fat-soluble vitamins. Most water-soluble vitamins, such as the vitamin B complex, act as catalysts and coenzymes in metabolic processes and energy transfer and are excreted fairly rapidly. Fat-soluble vitamins, such as vitamins A, D, and E are necessary for the function or structural integrity of specific body tissues and membranes and are retained in the body.

Water-soluble vitamins http://www.biocompare.com/images/techart/AN_ODS100VZ_02_1.jpg