Perfusion Relationships and Control of Ventilation
Homework 11
Ventilation-Perfusion Relationships and Control of Ventilation
Overall, the normal V/Q ratio is about
0.2
0.4
0.6
0.8
In a health individual in the upright position, the
V/Q ratio is highest in the lower lung regions
PACO2 is lowest in the upper lung regions
V/Q ratio is lowest in the upper lung regions
PACO2 is higher in the lower lung regions
1 only
2 only
4 only
3 and 4 only
When the V/Q ratio decreases, the
PAO2 falls
PCCO2 increases
PACO@ rises
PCO2 decreases
1 only
3 only
2, 3, and 4 only
1, 2, 3, and 4
When the alveolar ventilation is 7L/min and the pulmonary blood flow is 9.5 L/min, the V/Q ratio is about
0.4
0.5
0.6
0.7
If tissue cells consume 275 mL of O2 per minute and produce 195 mL of CO2 per minute, what is the RQ?
0.65
0.7
0.8
0.96
List pulmonary disorders that increase the V/Q ratio:
__
__
__
__
__
List some pulmonary disorder that decrease the V/Q ratio:
__
__
__
The DRG consists chiefly of:
Inspiration neurons
Expiration neurons
Inspiratory and expiratory neurons
The VRG consists chiefly of:
Inspiration neurons
Expiration neurons
Inspiratory and expiratory neurons
Which of the following play a greater role in causing the ventilatory rate to increase in response to a decreased PaO2?
Carotid bodies
Aortic bodies
Which of the following has the most powerful effect on the respiratory components of the medulla?
Decreased O2
Increased H+
Decreased CO2
Increased pH
Which of the following protects the lung from excessive inflation?
Juxtapulmonary-capillary receptors
Hering-Breuer inflation reflex
Irritant reflex
When the systemic blood pressure increases and aortic and carotid sinus baroreceptors initiate reflexes that cause an/a
Increase heart rate
Decreased ventilatory rate
Increased ventilatory rate
Decreased heart rate
A only
B only
C only
B and D only
Which of the following can cause a temporary cessation in breathing?
Sudden pain
Stimulation of proprioceptor
Sudden cold
Inhalation of noxious gases
A only
B only
C and D only
A and C only
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