CH 12 RESPIRATORY DEFINITIONS Flashcards
adenoids
lymphatic tissue in the nasopharynx; pharyngeal tonsils
alveolus
tiny air sac in the lungs
alveoli
plural, alveolus
apex of the lung
tip or uppermost portion of the lung; an apex is the tip of a structure; apical means pertaining to or located at the apex
base of the lung
lower portion of the lung; from the greek basis, foundation; basilar means located at or in the base
bronchioles
smallest branches of the bronchi. terminal bronchioles lead to alveolar ducts
bronchus
branch of the trachea (windpipe) that is a passageway into the lung bronchial tube
bronchi
plural; bronchus- refers to both sides left and right branches
carbon dioxide (CO2)
gas produced by body cells when oxygen and carbon atoms from food combine; exhaled through the lungs
cilia
thin hairs attached to the mucous membrane epithelium lining the respiratory tract; they clear bacteria and foreign substances from the lung; cigarette smoke impairs the function of cilia
diaphragm
muscle separating the chest and abdomen; it contracts to pull air into the lungs and relaxes to push air out
epiglottis
lid-like piece of cartilage that covers the larynx, preventing food from entering the larynx and trachea during swallowing
exhalation
breathing out; expiration
glottis
slit-like opening to the larynx
hilum of the lung
midline region where the bronchi, blood vessels, and nerves enter and exit the lungs; hilar means pertaining to (or at) the hilum
inhalation
breathing in; inspiration
larynx
voice box, contains vocal cords
lobe
division of a lung; 3 right, 2 left
mediastinum
region between the lungs in the chest cavity; it contains trachea, heart, lymph nodes, major blood vessels, esophagus, and bronchial tubes
nares
openings through the nose carrying air into the nasal cavities; nostrils
oxygen (O2)
gas that makes up 21 percent of the air that we breathe. it passes into the bloodstream at the lungs and travels to all cells of the body
palatine tonsil
one of a pair of almond-shape masses of lymphatic tissue in the oropharynx (palatine means pertaining to the roof of the mouth)
paranasal sinus
one of the air cavities in the bones near the nose
parietal pleura
outer layer of the pleura lying closer to the ribs and chest wall