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Physiology: Daily Free Online Mock Test 68

Author: rxpg, Posted on Thursday, August 21 @ 00:00:00 IST by rxpg  

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Physiology

Multiple Choice Test



1) In the HIS Bundle Electrogram (HBE), conduction time through AV node is indicated by which interval ?

One answer only.
   a) PA
   b) AH
   c) HV
   d) PR





2) All are true of laminar flow except :

One answer only.
   a) It is silent
   b) Its velocity profile is paraboloid
   c) It is less efficient than turbulant flow
   d) It is the type of flow seen in most parts of the vascular system



3) Permeability of the capillaries is minimum in :

One answer only.
   a) Brain
   b)Skin
   c)GI mucosa
   d) Glomerulus of the Kidney



4) All the following are true of A-V anastomoses except :

One answer only.
   a) They can be found in the fingers, palms and earlobes
   b) They connect arterioles to venules, bypassing capillaries
   c) They have thick muscular walls
   d) They are sparsely innervated



5) The most potent vasoconstrictor just isolated is :

One answer only.
   a) Norepinephrine
   b) Epinephrine
   c) Angiotensin II
   d) Endothelin 1



6) In an ECG recorded from the standard limb leads, the QRS complex was smallest in lead II. Also, it was predominantly positive (R taller than S wave) in lead I and predominantly negative (R shorter than S wave) in lead III. The mean electrical axis of the heart in this case must be close to :

One answer only.
   a) + 60 degrees
   b) + 90 degrees
   c) + 120 degrees
   d) - 30 degrees



7) Left atrial filling pressure closely approximates :

One answer only.
   a) CVP
   b) Intracranial pressure
   c) PCWP
   d) Intrapleural pressure



8) The pressure at one end of an artery is 60mmHg, the pressure at the other end of the artery is 20mmHg and the flow through the artery is 200ml / min. What is the resistance of the artery expressed in the above units :

One answer only.
   a) 0.5
   b) 0.1
   c) 0.2
   d)0.4
   e) 0.6



9) In cardiac muscle :

One answer only.
   a) Actin is absent from myofibrils
   b) Actin potential may last several hundred milliseconds
   c) Strength of contraction is unaffected by neural activity
   d) Transverse tubules are absent
   e) Extracellular calcium is not required to initiate contraction



10) The critical closing pressure of a blood vessel :

One answer only.
   a) Decreases during adrenergic alpha1 receptor activation
   b) Does not change if the blood vessel becomes less compliant
   c) Decreases if extravascular pressure decreases
   d)Increases during adrenergic beta2 receptor stimulation
   e) Does not change unless a patient is critically ill


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




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