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Chapter 21

Respiration and Excretion

alveoliin the lungs, the tiny, thin-walled sacs arranged in grapelike clusters at the end of each bronchiole
asthmalung disorder in which there may be shortness of breath, wheezing, or coughing and that may occur as an allergic reaction
bladdermuscular, elastic organ that holds urine until it leaves the body
bronchitwo short branches at the lower end of the trachea that carry air into the lungs
chronic bronchitislong-lasting respiratory disease in which the bronchial tubes are irritated and too much mucus is produced
diaphragmmuscle beneath the lungs that contracts and relaxes with breathing and that helps move air in and out of the body
emphysemarespiratory disease in which the alveoli in the lungs lose their ability to expand and contract
kidneybean-shaped organ of the urinary system that is made up of about one million nephrons and that filters blood to produce waste liquid
larynxairway to which the vocal chords are attached
nephrontiny filtering unit of the kidney
pharynxtubelike passageway for both food and air through which inhaled air passes after it is warmed and moistened in the nasal cavity
tracheacartilage-reinforced tube that remains open and connects with the bronchi
uretertube that leads from the kidney to the bladder
urethratube that carries urine from the bladder to the outside of the body
urinary systemsystem of excretory organs that rids the blood of wastes produced by the metabolism of nutrients
urinewaste liquid of the urinary system, containing excess water, salts, and other wastes

Middle School Science

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