RESPIRATORY SYSTEM:MCQS

RESPIRATORY SYSTEM
MCQS

TRUE OR FALSE


1.In inspiration
a.The abdomen moves outwards.
b.The costal margin moves outwards and upwards.
c.Centralvenous pressure increases.
d.Airways resistance is less than during expiration.
e.Intrapleural pressure is sub-atmospheric.

2.Surfactant:
a.Produces a greater lowering of surface tension in small bubbles than in large bubbles.
b.Activity in a surface is enhanced by transient increase in area or radius of curvature of the surface.
c.Is present in foetallungs from the 20th week of gestation.
d.Production is dependent upon pulmonary perfusion.

3.The closing volume of the lungs( CV )
a.is the volume of air expired before airways close off.
b.is small (20-50ml)during quiet expiratiopn in normal individual.
c.is associated with the closure of airways in the apex of the lung before closure elswhere.
d.increses in recumbency.
e.if it equals the tidalvolume,is incompatible with life.

4.In the mechanics of breathing:
a.the compliance is given by volume/pressure.
b.the compliance of the lung is about the same as that of the thoracic cage in young healthy adults.
c.the compliance of the thorax decreases in obesity.
d.the volume change lags begind the pressure change in both inflation and deflation of the lungs.
e.an estimate of elastic forces is given by area between inspiratory and expiratory traces on hysterresis loop.

5.Airway resistance:
a.is a major factor in the elastic resistance of the lungs.
b.is mainly determined by the calibre of the airways.
c.falls at high altitude
d.is inversely related to FEV1
e.increses as lung volume increases.

RESPIRATORY SYSTEM:ANS
1.a.True
b.True
c.False
d.True
e.True

2.a.True
b.True
c.False
d.True.

3.a.false
b.false
c.false
d.true
e.false

4.a.false
b.true
c.true
d.true
e.false

5.a.false
b.true
c.true
d.true
e.false