3420641
Descripción
Test por matthew.anselmo, actualizado hace más de 1 año
|
Creado por matthew.anselmo
hace más de 9 años
|
|
Pregunta 1
Pregunta
What is the primary function of the lungs?
Respuesta
-
convert angiotensin I to angiotensin II
-
filter pulmonary blood
-
gas exchange
-
remove carbon monoxide (CO)
Pregunta 2
Pregunta
During each cycle of normal resting ventilation, a volume of gas is moved into and out of the respiratory tract. This cyclical volume is called the:
Respuesta
-
residual volume (RV)
-
tidal volume (VT)
-
inspiratory reserve volume (IRV)
-
vital capacity (VC)
Pregunta 3
Pregunta
Which of the following pressures vary throughout the normal breathing cycle?
Respuesta
-
pleural pressure (Ppl
-
mouth pressure (Pao)
-
body surface pressure (Pbs)
-
alveolar pressure (Palv)
Pregunta 4
Pregunta
Which of the following pressures normally remains negative (relative to atmospheric pressure) during quiet breathing?
Respuesta
-
Pbs
-
Pao
-
Ppl
-
Palv
Pregunta 5
Pregunta
Which of the following pressure gradients is responsible for the actual flow of gas into and out of the lungs during breathing?
Respuesta
-
transthoracic pressure gradient (Ppl – Pbs)
-
transrespiratory pressure gradient (Palv – Pao)
-
transpulmonary pressure gradient (Palv – Ppl)
-
transcanadian pressure gradient (Ppc – Pks)
Pregunta 6
Pregunta
Which of the following pressure gradients is responsible for maintaining alveolar inflation?
Respuesta
-
transrespiratory pressure gradient (Palv – Pao)
-
transcanadian pressure gradient (Pca – Pks)
-
transthoracic pressure gradient (Ppl –Pbs)
-
transpulmonary pressure gradient (Palv – Ppl)
Pregunta 7
Pregunta
Which of the following statements about alveolar pressure (Palv) during normal quiet breathing is true?
Respuesta
-
It always remains less than atmospheric pressure.
-
It is negative during inspiration and positive during expiration.
-
It is the same as intrapleural pressure (Ppl).
-
It is positive during inspiration and negative during expiration.
Pregunta 8
Pregunta
What happens during normal inspiration?
Respuesta
-
Palv drops below that at the airway opening.
-
The transpulmonary pressure gradient widens.
-
The Ppl decreases further below atmospheric.
Pregunta 9
Pregunta
During normal tidal ventilation, the transpulmonary pressure gradient (Palv – Ppl) reaches its maximum value at what point in the cycle?
Respuesta
-
mid-expiration
-
end-inspiration
-
end-expiration
-
mid-inspiration
Pregunta 10
Pregunta
During expiration, why does gas flow out from the lungs to the atmosphere?
Respuesta
-
Airway pressure is greater than Palv.
-
Palv is greater than at the airway opening.
-
Palv is the same as at the airway opening
-
Palv is less than at the airway opening.
Pregunta 11
Pregunta
What forces must be overcome to move air into the respiratory system?
Respuesta
-
surface tension forces
-
airway resistance
-
elastic forces of lung tissue
-
tissue movement
Pregunta 12
Pregunta
What term is used to note the difference between inspiratory lung volume and expiratory lung volume at any given pressure?
Respuesta
-
transpulmonary pressures
-
pleural pressure variance
-
hysteresis
-
alveolar aphasia
Pregunta 13
Pregunta
What is the effect of surface tension forces in the air-filled lung?
Respuesta
-
It decreases the lung's elasticity as volume increases
-
It makes the lung harder to inflate than if it were filled with fluid
-
It increases the elastic recoil of the lung (promoting collapse).
Pregunta 14
Pregunta
The presence of surfactant in the alveoli tends to do which of the following?
Respuesta
-
increase resistance
-
increase elastance
-
decrease surface tension
-
decrease compliance
Pregunta 15
Pregunta
How is compliance computed?
Respuesta
-
change in volume/change in pressure
-
change in volume/change in flow
-
change in pressure/change in volume
-
change in pressure/change in flow
Pregunta 16
Pregunta
Normal lung compliance is approximately which of the following?
Respuesta
-
10.00 L/cm H2O
-
2.00 L/cm H2O
-
0.20 L/cm H2O
-
0.01 L/cm H2O
Pregunta 17
Pregunta
A lung that loses elastic fibers (as in emphysema) would exhibit which of the following characteristics?
Respuesta
-
increased pulmonary compliance
-
increased airway resistance
-
decreased pulmonary vascular resistance
-
decreased airways resistance
Pregunta 18
Pregunta
A fibrotic lung would exhibit which of the following characteristics?
Respuesta
-
decreased surface tension
-
decreased PVR
-
decreased lung compliance
-
decreased airway resistance
Pregunta 19
Pregunta
What occurs at a lung volume equivalent to the functional residual capacity (FRC)?
Respuesta
-
Opposing chest-wall-lung forces generate negative Ppl.
-
Chest wall expansion is offset by lung contraction.
-
The forces of the chest wall and lungs are in balance.
Pregunta 20
Pregunta
At approximately what point during a maximum inspiration does the chest wall reach its natural resting level?
Respuesta
-
about 90% of the VC
-
about 70% of the VC
-
about 40% of the total lung capacity (TLC)
-
about 30% of the VC
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.