test one. Flashcards
ventilation
the exchange of gases in and out of the lungs
perfusion
the distribution of RBCs to and from pulmonary capillaries
compliance
the ability of the lungs to distend or expand in response to increased intra-aveolar
pressure; decreased in diseases such as pulmonary edema, interstitial and pleura fibrosis, and
congenital or traumatic structural abnormalities such as kyphosis or fractured ribs
resistance
pressure difference between the mouth and the alveoli in relation to the rate of flow of
inspired gas. Airway resistance is increased with illnesses such as asthma and tracheal edema
tidal volume:
typical amount of air that can be inhaled by forcible inspiration after completion of a
normal inspiration
inspiratory reserve volume:
amount of air that can be forcibly expelled from the lungs after
breathing in as deeply as possible
expiratory reserve volume
air remaining in the lungs after the most complete expiration possible; it
is elevated in diffuse obstructive emphysema and during an attack of asthma. Also known as
residual air.
vital capacity:
the maximal volume of air that can be forcefully exhaled after taking the deepest
breath
residual volume:
the amount of gas remaining in the lung at the end of a maximal exhalation
total lung capacity
the maximal volume to which the lungs can be expanded with the greatest
possible inspiratory effort; it is equal to vital capacity plus the residual volume and is approx. 5800
mL
eupnea
the normal rate and depth of ventilation
bradypnea
rate of breathing is regular but abnormally slow (less than 12 breaths per minute)
tachypnea:
te of breathing is regular but abnormally rapid (greater than 20 breaths per minute)
hyperventilation
rate and depth of respirations increase; hypocarbia may occur
hypoventilation
respiratory rate is abnormally low and depth of ventilation may be depressed;
hypercarbia may occur
apnea
respirations cease for several seconds; persistent cessation results in respiratory arrest
dyspnea
cal sign of hypoxia and manifests as breathlessness; sometimes related to exercise;
associated with pulmonary diseases, cardiovascular diseases, neuromuscular conditions & anemia
orthopnea
abnormal condition in which the person must use multiple pillows when lying down or
must sit with the arms elevated and leaning forward to breathe