| Term | Definition |
|---|
| noninfectious disease | a disease that cannot spread from one person to another |
| infectious disease | a disease caused by a pathogen; can be spread |
| pathogens | agents that cause a disease |
| immunity | resistance to a disease |
| immune system | a collection of cells, tissues, and organs that fight disease-causing agents |
| macrophage | an immune-system cell that engulfs pathogens |
| t cells | an immune-system cell that matures in the thymus |
| b cells | an immune-system cell that matures in bones and makes antibodies |
| allergy | an inappropriate immune-system reaction to a harmless antigen |
| autoimmune disease | a disease in which the immune system attacks the cells of the body; it is meant to protect |
| cancer | a condition in which certain body cells begin dividing at an uncontrolled rate |
| addiction | a physical dependence on a drug |
| alcoholism | a disorder in which a person is physically and psychologically dependent on alcohol |
| narcotics | drugs made from opium |
| nutrient | a substance that must be consumed or taken in by an organism to promote normal growth, maintenance, and repair |
| carbohydrate | a biochemical composed of one or more simple sugars bonded together that is used to provide and store energy |
| protein | a biochemical that is composed of amino acids; its functions include regulating chemical reactions, transporting and storing materials, and providing support |
| fat | energy-storing nutrients that help the body store some vitamins |
| hygiene | methods of preserving and protecting your health |
| aerobic exercise | vigorous, sustained exercise of the whole body for 20 minutes or more |
| stress | a physical and mental response to situations that create pressure |
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