CARDIOVASCULAR SYSTEM MCQ – Exercise 23

The multiple choice questions in this online test paper focuses on CARDIOVASCULAR SYSTEM MCQ. If you are looking for self evaluation of your PG Medical entrance exam preparation then this online CARDIOVASCULAR SYSTEM MCQ Test Paper will help you to evaluate your exam preparation.

Instruction for REPRODUCTIVE BIOLOGY/ REPRODUCTIVE MEDICINE / INFERTILITY MCQs:

1- This online MCQ practice test paper contains 30 questions.
2- Each question in this online practice test paper have four options and only 1 option is correct.
3- You can view the answers of this practice test paper after submitting the practice test paper.
Note: The answers mentioned at the end of practice test are the best suitable option as per our knowledge. Users shall cross-check the answers with their textbooks.

Q 1. a prolongation of conduction time from SA node to surrounding atrial tissue is called

first degree block

second degree block

third degree block

none of the above

Q 2. which of the following neuromuscular disease produces SA node disease

myasthnenia gravis

botulism

lambert eaton syndrome

kearns – sayre syndrome

Q 3. in susceptible individual, SA node dysfunction may become manifest in the presence of which of the following

cardiac glycosides

amiodarone

calcium channel blockers

all of the above

Q 4. in sinus arrest and in sinus exit block, atrial systole is of what duration

> 1 seconds

> 1.5 seconds

> 2.5 seconds

> 3 seconds

Q 5. lack of atrial activity or the presence of an ectopic subsidiary atrial pacemaker is called

first degree block

second degree in siree block

third degree block

none of the above

Q 6. which of the following pharmological agents may improve SA node function

class I antiarrhythmic

class III which of the following

calcium channel blockers

digitalis

Q 7. membrane potential of SA nodal cells is

-20 to -40 mV

-40 to -60 mV

-60 to -80 mV

-80 to -100 mV

Q 8. which of the following is not a feature of SA nodal cells

fewer myofibrils

no intercalated disks

well developed sarcoplasmic reticulum

no tubules

Q 9. sinus braducardia is associated with all except

hypothyroidism

advanced liver disease

trypnosomiasis

brucellosis

Q 10. AV nodal cells lack which of the following

INa

Ica-l

Ica-T

Q 11. sinus arrests means

failure of sinus impulse formation

failure of conduction of sinus impulses to surrounding atrial tissue

failure of conduction of sinus impulses at AV node

failure of conduction of sinus impulses beyond AV node

Q 12. sick sinus syndrome refers to a combination of all except

sinus bradycardia

Sinoatrial block

sinus arrest

sinus arrhythmia

Q 13. cushings response is best related to

visual blurring

accelerated hypertension

increased intracranial pressure

dermopathy

Q 14. which of the following is false about Mobitz type 1 SA nodal exit block

regularly irregular heart rhythm

decreasing P-P intervals before the pause

pause < twice the cycle length of last sinus interval

none of the above

Q 15. which of the following about His bundle and bundle branches is false

minimally influenced by autonomic tone

have most rapid conduction in heart

insulated from ventricular myocardium

none of the above

Q 16. normal AV node in vivo possesses

automaticity always

automaticity sometimes

no automaticity

none of the above

Q 17. ECG manifestations of SA node dysfunction include

sinus pauses

sinus block

tachycardia

all of the above

Q 18. nodal cell action potentials exhibit which of the following

more depolarizing resting membrane potentials

slower phase 0 upstrokes

slower phase 4 diastolic depolarization

all of the above

Q 19. the AV node lies at the

base of interatrial septum just above tricuspid annulus and anterior to coronary sinus

base of interatrial septum just below tricuspid annulus and anterior to coronary sinus

base of interatrial septum just above tricuspid annulus and posterior to coronary sinus

base of interventriculal septum just above tricuspid annulus and anterior to coronary sinus

Q 20. chronotropic incompetence is failure to reach what percentage of predicted maximal heart rate at peak exercise

55%

65%

75%

85%

Q 21. in majority SA nodal artery arises from

right coronary artery

left anterior descending artery

left circumflex artery

posterior descending artery

Q 22. which of the following statements is false

AV node is a subendocardial

lacated at posterior inferior right atrium

located at apex of triangle of koch

none of the above

Q 23. sinus exit block means

failure of sinus impulse formation

failure of conduction of sinus impulses to surrounding atrial tissue

failure of conduction of sinus impulses at AV node

failure of conduction of sinus impulses beyond AV node

Q 24. intermittent absence of P waves on ECG is due to

second degree AV block

sinus exit block

sinus arrest

sick sinus syndrome

Q 25. myocytes that constitute the compact node having a resting membrane potential of about

-50 mV

-60 mV

-70 mV

-80 mV

Q 26. in tachycardia – bradycardia syndrome which of the following is the most common tachycardia

atrial tachycardia

atrial flutter

atrial fibrillation

any of the above

Q 27. which of the following is a sensitive and specific indicator of intrinsic SA node disease

SNRT (sinus node recovery time)

SACT (Sinoatrial conduction time)

low intrinsic heart rate

all of the above

Q 28. the intermittent failure of conduction of sinus impulse to surrounding atrial tissue is called

first degree block

second degree block

third degree block

none of the above

Q 29. boundaries of triangle of Koch include all except

coronary sinus ostium

septal tricuspid valve annulus

septal mitral valve annulus

tendon of todaro

Q 30. normal values of intrinsic heart rate are circulated by the formula

116.2-( .53×age) beats per minute

117.2-( .53×age) beats per minute

118.2-(.53×age) beats per minute

119.2-(.53×age) beats per minute

CARDIOVASCULAR SYSTEM MCQ – Exercise 23

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CARDIOVASCULAR SYSTEM MCQ – Exercise 23

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