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Respiratory System Unit Vocab
Respiratory System Unit Vocab
15
Science
7th Grade
02/04/2006

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Term
pharynx
Definition
tubelike passageway for both food and air through which inhaled air passes after it is warmed and moistened in the nasal cavity. (ch. 21, p. 577)
Term
larynx
Definition
airway to which the vocal chords are attached. (ch. 21, p. 577)
Term
trachea
Definition
tube with rings of cartilage to keep it open & prevent it from collapsing; is lined with mucous and cilia to trap dust, bacteria and pollen.
Term
bronchi
Definition
two short branches at the lower end of the trachea that carry air into the lungs. (ch. 21, p. 578)
Term
alveoli
Definition
in the lungs, the tiny, thin-walled sacs arranged in grapelike clusters at the end of each bronchiole; oxygen and carbon dioxide exchange takes place between the alveoli and capillaries. (ch. 21, p. 578)
Term
diaphragm
Definition
muscle beneath the lungs that contracts and relaxes with breathing and that helps move air in and out of the body. (ch. 21, p. 579)
Term
chronic bronchitis
Definition
long-lasting respiratory disease in which the bronchial tubes are irritated and too much mucus is produced. (ch. 21, p. 581)
Term
emphysema
Definition
respiratory disease in which the alveoli in the lungs lose their ability to expand and contract. (ch. 21, p. 582)
Term
asthma
Definition
lung disorder in which there may be shortness of breath, wheezing, or coughing and that may occur as an allergic reaction. (ch. 21, p. 583)
Term
capillary
Definition
microscopic blood vessel that connects arteries and veins; nutrients, oxygen, waste materials, and carbon dioxide diffuse through its walls.
Term
breathing
Definition
process whereby fresh air moves into and stale air moves out of the lungs
Term
respiration
Definition
the chemical reaction in which oxygen from the air we breathe is combined with the glucose from the food we eat to produce energy, carbon dioxide, and water vapor
Term
epiglottis
Definition
small flap of tissue that normally closes over the tracheal opening when food is swallowed; prevents food and liquid from entering the larynx
Term
bronchioles
Definition
the bronchi branch into these smaller and smaller tubes. At the end of these tubes are clusters of tiny, thin-walled sacs.
Term
lung cancer
Definition
major cause is smoking;leading type of cancer deaths
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