Dr Gawad Physiology Course Online Exam - CVS – Course Lecture 2 – Excitability, Conductivity, Contractility
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 min Good Luck dr Mohammed Abel Gawad
- 1.The most rapid conduction velocity is present:
- A.
The SAN.
- B.
The AVN.
- C.
The ventricular muscle.
- D.
The Purkinje fibres.
- 2.About the cardiac conductivity, all the following is true except:
- A.
It is slowest in the AV node.
- B.
It is maximal in the Purkinje fibres.
- C.
It is slowest in the ventricular muscle.
- D.
It is decreased by vagal stimulation.
- E.
It occurs through modified cardiac muscle fibres.
- 3.In the AV conduction all the following is true except:
- A.
Conduction is the slowest.
- B.
Conduction is delayed.
- C.
Conduction is usually difficult in the ventriculo-atrial direction.
- D.
Conduction is enhanced by sympathetic stimulation.
- 4.The fibres of the A-V bundle & its branches :
- A.
Conduct impulses very slowly.
- B.
Are highly contractile.
- C.
Are modified muscle fibres.
- D.
Are nerve fibres
- E.
A & c
- 5.The main function of the cardiac Purkinjie system is to :
- A.
Increase the speed of impulse conduction through the cardiac muscle.
- B.
Prevent premature ventricular beats.
- C.
Coordinate the valve movements with myocardial contraction.
- D.
Enable all parts of the ventricle to contract simultaneously.
- E.
Delay the systole until the ventricles fill.
- 6.About cardiac contractility all the following is true except:
- A.
It depends on the interaction between actin and myosin.
- B.
It increases when the serum K+ rises above normal.
- C.
It is lost if the bathing medium is made calcium-free.
- D.
It needs ATPase activity during systole and diastole
- 7.Within physiological limits, if the EDV is increased:
- A.
The force of cardiac contraction is increased.
- B.
The cardiac output is increased.
- C.
Starling's law is applicable.
- D.
All of the above.
- 8.Regarding cardiac cells excitability which is true:
- A.
ARP is too short
- B.
Tetany may occur on reptetive stimulation
- C.
Heart is applying all or none rule
- D.
None of the above
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