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Physiology: Daily Free Online Mock Test 73

Author: rxpg, Posted on Tuesday, August 26 @ 00:00:00 IST by rxpg  

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Physiology

Multiple Choice Test



1) Calculate PAO2 if FiO2 = 20% , PB = 747 mmHg, PACO2 = 40mmHg :

One answer only.
   a) 90mmHg
   b)110mmHg
   c) 60mmHg
   d) 140mmHg





2) Calculate the dissolved O2 in plasma if PaO2 = 40mmHg ( % saturation of Hb at PaO2 = 75%) and Hb concentration = 15mg/dL :

One answer only.
   a) 0.2 ml /dL
   b) 0.12ml / dL
   c)20ml / dL
   d) 15ml / dL



3) All the following are true of VA and Q in the lungs of a healthy, standing individual except :

One answer only.
   a) Q is greater at the base than at the apex
   b) VA is greater at the apex than at the base
   c) VA / Q is greater at the apex than at the base
   d) Differences in VA / Q from apex to base are less during exercise
   e) The VA / Q distribution causes higher PAO2 at the apex than at the base



4) If the PO2 in a blood sample is not changed, which of the following will cause a decrease in the content of O2 in the blood ?

One answer only.
   a) An increase in 2, 3 DPG
   b) A decrease in temperature
   c)An increase in pH
   d) A decrease in PCO2
   e) An increase in Hb



5) Airway resistance :

One answer only.
   a)Is greater during inspiration than during expiration
   b)Is lower when near FRC than when near TLC
   c) Is increase by sympathetic stimulation
   d) Is decreased in asthma
   e) Is increased by histamine



6) Occlusion of the left pulmonary artery would cause :

One answer only.
   a) An increase in shunt fraction
   b) An increase in PIO2
   c)An increase in anatomical dead space
   d) A decrease in anatomical dead space
   e) An increase in physiological dead space



7) During the acclimatisation to high altitude :

One answer only.
   a) The sensitivity of the carotid bodies to hypoxia increases
   b) The sensitivity of the central chemoreceptors to hypoxia increases
   c) The sensitivity of the carotid sinuses to hypoxia decreases
   d) The HCO3- concentration in the blood increases
   e) The HCO3- concentration in the brain decreases



8) If a person with PAO2 = 125mmHg and PACO2 = 20mmHg doubles VA without changing metabolic rate, PAO2 will become (in mm Hg)

One answer only.
   a) 75
   b) 110
   c) 115
   d) 132
   e) 138



9) A liquid ventilated lung compared to a gas ventilated lung :

One answer only.
   a) Has reduced airway resistance
   b) Has pronounced hysteresis
   c) Is more compliant
   d) Requires greater pressure to inflate
   e)Has increased residual volume



10) Within Zone II (middle zone) in the lung, flow occurs :

One answer only.
   a) During diastole only
   b) During systole and diastole
   c) During systole only
   d) Periodically during diastole


You can discuss the answers and queries of RxPG mediMOCKS in our new mediMOCK Discussion Forum




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