Metabolism : is a series of complex processes by which the human body converts food, water, and oxygen into tissue, energy, and waste products. It is a continuous process and goes on in every cell of the body. It comprises the breaking down of substances into simpler parts, and their shuffling and recombination into countless new substances that compose the body. For example, the carbohydrates are broken down by enzymes and acids and converted into pure sugar or glucose.
The constructive chemical and physical process by which food materials are adapted for the use of the body is known as anabolism; and the destructive process by which energy is produced with the breaking down of tissues into waste products is called catabolism. The two processes together are called metabolism.
Basal Metabolic Rate: is the rate at which energy is consumed when a person is at complete rest. When a person is placed in a state of complete rest, the metabolic rate can be measured by measuring the amounts of oxygen and carbon dioxide exchanged during breathing under certain standard conditions. The BMR (Basal Metabolic Rate) is an index of a persons health.
Endocrine glands : Metabolism is controlled by the endocrine glands--a term applied to certain organs whose function is to secrete into the blood or lymph, a substance which plays an important role in relation to general chemical changes or to the activities of the other organs at a distance. The chief endocrine glands are the thyroid gland, adrenal glands, pituitary body, parathyroid glands, pancreas, ovaries, and the testes.