Dr Gawad Physiology Course Online Exam - CVS – Course Lecture 2 – Excitability, Conductivity, Contractility

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  • 1/8 Questions

    Within physiological limits, if the EDV is increased:

    • The force of cardiac contraction is increased.
    • The cardiac output is increased.
    • Starling's law is applicable.
    • All of the above.
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About This Quiz

8 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 8 (you will get your result immediately by the web)
Allowed time: 8 minGood Luckdr Mohammed Abel Gawad

Dr Gawad Physiology Course Online Exam - CVS Course Lecture 2 Excitability, Conductivity, Contractility - Quiz

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  • 2. 

    The most rapid conduction velocity is present:

    • The SAN.

    • The AVN.

    • The ventricular muscle.

    • The Purkinje fibres.

    Correct Answer
    A. The Purkinje fibres.
  • 3. 

    About the cardiac conductivity, all the following is true except:

    • It is slowest in the AV node.

    • It is maximal in the Purkinje fibres.

    • It is slowest in the ventricular muscle.

    • It is decreased by vagal stimulation.

    • It occurs through modified cardiac muscle fibres.

    Correct Answer
    A. It is slowest in the ventricular muscle.
  • 4. 

    In the AV conduction all the following is true except:

    • Conduction is the slowest.

    • Conduction is delayed.

    • Conduction is usually difficult in the ventriculo-atrial direction.

    • Conduction is enhanced by sympathetic stimulation.

    Correct Answer
    A. Conduction is usually difficult in the ventriculo-atrial direction.
  • 5. 

    The fibres of the A-V bundle & its branches :

    • Conduct impulses very slowly.

    • Are highly contractile.

    • Are modified muscle fibres.

    • Are nerve fibres

    • A & c

    Correct Answer
    A. A & c
  • 6. 

    About cardiac contractility all the following is true except:

    • It depends on the interaction between actin and myosin.

    • It increases when the serum K+ rises above normal.

    • It is lost if the bathing medium is made calcium-free.

    • It needs ATPase activity during systole and diastole

    Correct Answer
    A. It increases when the serum K+ rises above normal.
  • 7. 

    The main function of the cardiac Purkinjie system is to :

    • Increase the speed of impulse conduction through the cardiac muscle.

    • Prevent premature ventricular beats.

    • Coordinate the valve movements with myocardial contraction.

    • Enable all parts of the ventricle to contract simultaneously.

    • Delay the systole until the ventricles fill.

    Correct Answer
    A. Enable all parts of the ventricle to contract simultaneously.
  • 8. 

    Regarding cardiac cells excitability which is true:

    • ARP is too short

    • Tetany may occur on reptetive stimulation

    • Heart is applying all or none rule

    • None of the above

    Correct Answer
    A. Heart is applying all or none rule

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  • Current Version
  • Mar 21, 2022
    Quiz Edited by
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  • Mar 16, 2018
    Quiz Created by
    Gawad
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