| A | B |
|---|
| Alveoli | tiny, thin-walled, grapelike clusters at the end of each bronchiole that are surrounded by capillaries; carbon dioxide and oxygen exchange take place |
| Asthma | lung disorder in which the bronchial tubes contract quickly and cause shortness of breath, wheezing, or coughing; may occur as an allergic reaction |
| Bladder | elastic, muscular organ that holds urine until it leaves the body through the urethra |
| Bronchi | two short tubes that branch off the lower end of the trachea and carry air into the lungs |
| Diaphragm | muscle beneath the lungs that contracts and relaxes to move gases in and out of the body |
| Emphysema | lung disease in which the alveoli enlarge |
| Kidney | bean-shaped urinary system organ that is made up of about 1 million nephrons and filters blood, producing urine |
| Larynx | airway to which the vocal cords are attached |
| Nephron | tiny filtering unit of the kidney |
| Pharynx | tube-like passageway for food, liquid, and air |
| Trachea | air-conducting tube that connects the larynx with the bronchi; is lined with mucous membranes and cilia, and contains strong cartilage rings |
| Ureter | tube that carries urine from each kidney to the bladder |
| Urethra | tube that carries urine from the bladder to outside the body |
| Urinary system | system of excretory organs that rids the body blood of wastes, controls blood volume by removing excess water, and balances concentration of salts |
| Urine | wastewater that contains excess water, salts, and other wastes that are reabsorbed by the body |
