RESPIRATORY SYSTEM:MCQS

RESPIRATORY SYSTEM
MCQS

TRUE OR FALSE
1.During normal quiet tidal breathing:
a.the dome of the diaphragm hardly moves at all.
b.the upper external intercostal musles help aerate the bases of the lungs.
c.paralysis of the external intercostal muscle reduces the tidalvolume by about 10%
d.there is a decrese in both intrapleuralpressure and intraalveolarpressure during the inspiratory phase.
e.the actual amountof air shifted eachtime by an adult is about 250 ml.

2.Concering volumes &capacities
a.a capacity is 2 or more volumes added together.
b.vital capacity (VC) can be used to monitor heart failure.
c.the VC falls significantly on recumbency in normal people.
d.VC is a good screening test of lung function.
e.the residual volume is exaled in maximal expiration.

3.the functional residual capacity (FRC)
a.is related in a linear fashion to one's height.
b.falls markedly as one gets older.
c.is increased in emphysema.
d.rises in recumbency.
e.should normally be about 40% of the total lung capacity.

4.In the alveoli:
a.type 1 pneumocytes form the major part of the surface.
b.type 2 pneumocytes produce surfactant.
c.type 3 pneumocytes contain concentric lamellated bodies.
d.gas flow is highly turbulent.
e.macrophages are usually present.

5.In normal lungs
a.in the upright posture ventilation is greater at the apex than at the base.
b.in the upright posture ventilation:perfusion ratio increases from base to apex.
c.residual volume is less than 35% of total lung capacity.
d.airways resistance falls during expiration.

6.Arterial pco2:
a.can be measured directly using an electrode.
b.can be calculated from measurements of PH of arterial blood when fresh and after eqilibration to varying blevels of pco2 in a tonometer.
c.can be estimated by analysis of end expired air.
d.is directly propotional to alveolar ventilation under steady state conditions. RESPIRATORY SYSTEM
MCQS

TRUE OR FALSE
ANSWERS

1.a.false.(diaphragm moves about 1cm during quiet breathing & about 10 cm during hyperventilation.
b.true
c.false.(bcz diaphragm is so effective.)
d.true.
e.false.(tidal vol is 500ml)

2.a.true
b.true
c.true
d.false(vc depends on chest compliance ,muscle power,&body size)
e.false.

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

4.a.true
b.true
c.false
d.false(by diffusion,linear velosity is very low)
e.true

5.a.false
b.false
c.true
d.false(increases)

6.a.true.(severinghaus co2 electrode)
b.true(this describes Astrup technique)
c.true
d.true.
***-----***-----***-----***