Test
Chapter 10 Ventilation (1-20)
Preguntas del test (20)
1What is the primary function of the lungs?
- Aconvert angiotensin I to angiotensin II
- Bfilter pulmonary blood
- Cgas exchange
- Dremove carbon monoxide (CO)
2During 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:
- Aresidual volume (RV)
- Btidal volume (VT)
- Cinspiratory reserve volume (IRV)
- Dvital capacity (VC)
3Which of the following pressures vary throughout the normal breathing cycle?
- Apleural pressure (Ppl
- Bmouth pressure (Pao)
- Cbody surface pressure (Pbs)
- Dalveolar pressure (Palv)
4Which of the following pressures normally remains negative (relative to atmospheric pressure) during quiet breathing?
- APbs
- BPao
- CPpl
- DPalv
5Which of the following pressure gradients is responsible for the actual flow of gas into and out of the lungs during breathing?
- Atransthoracic pressure gradient (Ppl – Pbs)
- Btransrespiratory pressure gradient (Palv – Pao)
- Ctranspulmonary pressure gradient (Palv – Ppl)
- Dtranscanadian pressure gradient (Ppc – Pks)
6Which of the following pressure gradients is responsible for maintaining alveolar inflation?
- Atransrespiratory pressure gradient (Palv – Pao)
- Btranscanadian pressure gradient (Pca – Pks)
- Ctransthoracic pressure gradient (Ppl –Pbs)
- Dtranspulmonary pressure gradient (Palv – Ppl)
7Which of the following statements about alveolar pressure (Palv) during normal quiet breathing is true?
- AIt always remains less than atmospheric pressure.
- BIt is negative during inspiration and positive during expiration.
- CIt is the same as intrapleural pressure (Ppl).
- DIt is positive during inspiration and negative during expiration.
8What happens during normal inspiration?
- APalv drops below that at the airway opening.
- BThe transpulmonary pressure gradient widens.
- CThe Ppl decreases further below atmospheric.
9During normal tidal ventilation, the transpulmonary pressure gradient (Palv – Ppl) reaches its maximum value at what point in the cycle?
- Amid-expiration
- Bend-inspiration
- Cend-expiration
- Dmid-inspiration
10During expiration, why does gas flow out from the lungs to the atmosphere?
- AAirway pressure is greater than Palv.
- BPalv is greater than at the airway opening.
- CPalv is the same as at the airway opening
- DPalv is less than at the airway opening.
11What forces must be overcome to move air into the respiratory system?
- A surface tension forces
- Bairway resistance
- Celastic forces of lung tissue
- Dtissue movement
12What term is used to note the difference between inspiratory lung volume and expiratory lung volume at any given pressure?
- Atranspulmonary pressures
- Bpleural pressure variance
- Chysteresis
- Dalveolar aphasia
13What is the effect of surface tension forces in the air-filled lung?
- AIt decreases the lung's elasticity as volume increases
- BIt makes the lung harder to inflate than if it were filled with fluid
- CIt increases the elastic recoil of the lung (promoting collapse).
14The presence of surfactant in the alveoli tends to do which of the following?
- Aincrease resistance
- Bincrease elastance
- Cdecrease surface tension
- Ddecrease compliance
15How is compliance computed?
- Achange in volume/change in pressure
- Bchange in volume/change in flow
- Cchange in pressure/change in volume
- Dchange in pressure/change in flow
16Normal lung compliance is approximately which of the following?
- A10.00 L/cm H2O
- B2.00 L/cm H2O
- C0.20 L/cm H2O
- D0.01 L/cm H2O
17A lung that loses elastic fibers (as in emphysema) would exhibit which of the following characteristics?
- Aincreased pulmonary compliance
- Bincreased airway resistance
- Cdecreased pulmonary vascular resistance
- Ddecreased airways resistance
18A fibrotic lung would exhibit which of the following characteristics?
- Adecreased surface tension
- Bdecreased PVR
- Cdecreased lung compliance
- Ddecreased airway resistance
19What occurs at a lung volume equivalent to the functional residual capacity (FRC)?
- AOpposing chest-wall-lung forces generate negative Ppl.
- BChest wall expansion is offset by lung contraction.
- C The forces of the chest wall and lungs are in balance.
20At approximately what point during a maximum inspiration does the chest wall reach its natural resting level?
- Aabout 90% of the VC
- Babout 70% of the VC
- Cabout 40% of the total lung capacity (TLC)
- Dabout 30% of the VC
Información
- Descripción
- Test sobre Chapter 10 Ventilation (1-20), creado por matthew.anselmo el 09/09/2015.
- Autor
- matthew.anselmo
- Idioma
- English
- Visitas
- 54
- Valoración
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