Ventilation - perfusion ratio

A Is the ratio of pulmonary ventilation to pulmonary blood flow
B Varies in various parts of lungs as an effect of gravity
C In upright position declines in a linear fashion from base to apex
D Non-uniformity of ventilation and perfusion of lungs can cause decline in co2 content
E Uniformity of this ratio can cause decline in systemic arterial PO2

Correct Answer: Is the ratio of pulmonary ventilation to pulmonary blood flow, Varies in various parts of lungs as an effect of gravity

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Related Questions

The pulmonary ventilation perfusion ratio is
A Increased by hemorrhage
B About 0.8 at heart Level
C More in base than apex on erect posture
D Decreased in exercise
E Decreased with increased physiological dead space ( ↓ in Physiological shunt )
Duration of inspiration is decreased and rate of ventilation is increased due to stimulation of
A Pneumotaxic center
B Apneustic center
C Vagus nerve
D Nucleus of tractus solitarius
E Ventral respiratory group
Changes that occur during different phases of pulmonary ventilation are
A Right ventricular stroke volume is more during inspiration compared to left ventricular stroke volume
B Physiological splitting of 2nd heart sound is more prominent during inspiration
C Increase in heart rate during inspiration
D Most of the tidal air enters into the upper part of the lung.
E Fall in intra abdominal pressure during inspiration
How many types of ventilation are there?
A 3
B 4
C 2
D 5
Pick up the mechanical ventilation method used for tunnels from the following:
A Blowing fresh air by ducts to the face of tunnel
B Exhausting foul air by ducts from the face of the tunnel and permitting fresh air through the tunnel
C Blowing fresh air and exhausting foul air by ducts
D All the above
The function of positive crankcase ventilation (PCV) system is that it
A Mixes fuel with air
B Promotes combustion by creating a swirling movement in the air-fuel mixture
C Returns blow by gases from the crankcase to the intake system
D Feeds blow by gases to the exhaust manifold
Inter-distance between ventilation columns in a sewer line is kept
A 25 to 50 m
B 50 m to 100 m
C 100 m to 150 m
D 150 m to 300 m
A and B are in the ratio of 5: 4 , B and C in the ratio of 3 : 2. What is the ratio of A : C ?
A 15
B 16
C 17
D None of these
The ratio of the age of a man and his wife is 4:3. At the time of their marriage the ratio was 5:3 and after 4 years this ratio will become 9:7. How many years ago were they married?
A 12 years
B 6 years
C 3 years
D 2 years
The ratio of boys to girls in class A is 3 to 4 . The ratio of boys to girls in class B is 4 to 5 . If the two classes were combined, the ratio of boys to girls in class B is two less than the number of girls in class A. How many girls are in class A?
A 87
B 11
C 12
D 15

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