| A | B |
|---|
| addiction | a physical dependence on a substance; an intense need by the body for a substance |
| alveoli | tiny sacs of lung tissue specialized for the movement of gases between the air and the bloob |
| brochi | the passages that branch from the trachea and direct air into the lungs |
| bronchitis | an irritation of the breathing passages in which the small passages become narrower than normal and may be clogged with mucus |
| carbon monoxide | a colorless,odorless gas produced when substances - including tobacco- are burned |
| cilia | the hairlike projections on the outside of cells that move in a wavelike manner |
| diaphragm | a large dome-shaped muscle in a mammel's chest that plays an important role in breathing |
| excretion | the process by which wastes are removed from the body |
| emphysema | a serious disease that destroys lung tissue and causes difficulty in breating |
| kidney | an organ of the excretory system; removes urea,excess water, and other waste materials from the body |
| lungs | the main organs of the respiratory system,where gas exchange takes place |
| larnyx | two folds of tissue that make up the human voice box;located in the top part of the trachea,underneath the |
| nicotine | a drug in tobacco that speeds up the activities of the nervous system,heart, and other organs of the body |
| nephron | one of a million tiny,filtering structures found in the kidneys that removes wastes from blood and produces urine |
| respiration | the process by which cells breakdown simple food molecules to release the energy they contain |
| tar | a dark,sticky substance produces when tabcco burns |
| trachea | the windpipe;a apssage through which air moves in the respiratory system |
| urea | a chemical that comes from the breakdown of proteins and is removes from the body by the kidneys |
| urine | a watery fluid produced by the kidneys that contains urea and other waste materials |
| ureters | a narrow tube that carries urine from one of the kidneys to the urinary bladder |
| urinary bladders | a saclike muscular organ that stores urine until it is eliminated from the body |
| urethra | a small tube through which urine flows from the body |
| vocal cords | folds of connective tissue that stretch across the opening of the larnyx and produce a person's voice |
| pharynx | the throat; part of both the respiratory and digestive systems |
