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Physiology: Daily Free Online Mock Test 69

Author: rxpg, Posted on Friday, August 22 @ 00:00:00 IST by rxpg  

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Multiple Choice Test

1) The pressure pulse wave in systemic arteries :

One answer only.
   a) Propagates at about 0.7m / sec
   b) Is initiated by the ejection of blood into the aorta
   c)Is palpable at the wrist, 1 second after ventricular ejection
   d)Has the same velocity as arterial blood flow
   e) Is unaffected by arterial vasoconstriction

2) Activation of atrial stretch receptors :

One answer only.
   a) Releases renin from the JG cells
   b) Increases renal Na+ excretion
   c) Triggers the CNS ischaemic response
   d)Causes reflex vasoconstriction of peripheral arteries
   e) Decreases urine production

3) Coronary artery blood flow :

One answer only.
   a) Does not depend on arterial B.P.
   b) Is greatest during systole in the left circumflex coronary artery
   c) Is regulated mainly by myocardial O2 consumption
   d)Accounts for about 10% of the cardiac output
   e) Is greatest during diastole in the right coronary artery

4) All are true of isovolemic contraction phase except :

One answer only.
   a) It accounts for the entire pre ejection period (PEP) of the electromechanical systole
   b) It occurs before left ventricular ejection time (LVET)
   c) All the valves are closed
   d) It is the phase of maximum rate of rise of left ventricular pressure

5) In cardiac muscle, the strength of a contraction would be increased by all the following except :

One answer only.
   a) Inhibition of Na+ - Ca++ exchange
   b) Lengthening of sarcomeres
   c) Phosphorylation of the SR Calcium pump
   d) Inhibition of Na+ - K+ pump
   e) A decrease in heart rate

6) A decrease in K+ conductance is associated with which of the phases of the ventricular action potential ?

One answer only.
   a) 0
   b) 1
   c) 2
   e) 4

7) Phase 2 corresponds to which component of the ECG ?

One answer only.
   a) P - wave
   b) P - R interval
   c) QRS complex
   d) S - T segment
   e)T wave

8) The amplitude of the pulse pressure in the aorta is :

One answer only.
   a) Directly proportional to the stroke volume
   b) Directly proportional to the aortic capacitance
   c) Directly proportional to the peripheral resistance
   d) Calculated by adding one third of the difference between systolic and diastolic pressure to the diastolic pressure.
   e) Greater in the proximal than in the distal aorta

9) A patient absorbs 300ml / min of oxygen. The O2 content of the blood taken to the femoral artery = 18ml / 100ml ; blood taken from the pulmonary artery has an oxygen content of 13ml / 100ml and blood taken from the femoral vein has an oxygen content of 140ml / 100ml. If the patient has a heart rate of 60 beats per min, the patient’s stroke volume is :

One answer only.
   a) 10ml
   b) 12.5ml
   c) 80ml
   d) 100ml

10) The most important physiological regulator of resistance in cutaneous blood vessels is :

One answer only.
   a) Lactic acid
   b) Adenosine
   c) Potassium
   d) Norepinephrine
   e) CO2

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