17 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 17 (you will get your result immediately by the web)
Allowed time: 20 min
Good Luck
dr Mohammed Abel Gawad
Ca is not important for its maintenance
Na is important to initiate it, but not important for its maintenance
Repolarization is due to out flux of K in exchange of Na
None of the above
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Out flux of K in exchange of Na
Outflux of K
Influx of Ca in exchange to efflux of Na
The balance in influx of and out flux of positive ions along the membrane
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Are unstriated muscle fibres.
Form true syncytium
Are poor in mitochondria.
Have low resistance bridges and tight gap junctions.
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Cardiac muscle action potential has lower magnitude than pacemaker
Both have fast depolarization
Both have 2 parts repolarization
Pacemaker action potential is unstable while cardiac muscle potential is not.
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Slow decrease in K+ permeability
Slow increase in K permeability.
Hyperpolarization stimulating voltage gated Na channels.
Rapid increase in Ca permeability.
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Atrioventricular node (AVN).
Bundle of His.
Purkinje fibres.
Sinoatrial node (SAN).
Ventricular muscle cells.
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It is richer in blood supply.
It ejects blood through a narrower orifice.
It ejects a greater cardiac output.
It ejects blood against a higher pressure.
It contracts at a higher rate
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Denotes a high excitability of cardiac muscle
Longer than skeletal muscles.
Extends till the end of repolarization.
Allows sustained tetanic cardiac contraction
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Due to the leaky nature of the SAN membrane to Ca ion.
Due to the Ca effect on repolarization.
It coincides with the cardiac diastole.
It coincides with action of the Na - K pump on the cardiac muscle action potential.
C & D
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Normal pacemaker is acting
AVN takes the upper hand of rhythmicity
An ectopic pacemaker is acting
None of the above
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Heart rate that is produced by AVN
Heart rate that is produced due to the permeability of SAN to Na
Heart rate that is produced by atrial muscles
None of the above
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AV bundle.
SAN with vagal tone.
Ventricular muscle.
A.V.N.
Purkinje fibres.
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Its amplitude is -80 to -90 mV.
It is unstable during rest.
Its slope is decreased by increased permeability to K.
The firing level occurs at a potential difference of about -45 mV.
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Ventricle contraction increases during exercise.
Ventricles ejection of blood escapes from the ventricles into aorta and pulmonary artery.
There is no vagal autonomic fibers suppling the ventricles.
The ventricles devoid of any conducting nodes.
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SAN
AVN
Bundle of His
Ventricular muscle
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The initial repolarization is due to K efflux
The plateau is due to balance between the Ca, Na, K mobility
The complete repolariztion is at the end of phase 3 when all K is effluxed
Na is an important ion for depolarization
None of the above
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Dr Gawad Physiology Course Online Exam - CVS - Course Lecture 1- Introduction, Rhythmicity
11 MCQs (Only one correct answer)
Each MCQ: 1 mark, Total mark: 11
Allowed time: 10 min
Good Luck
dr Mohammed Abel Gawad
Questions:
11 |
Attempts:
1564 |
Last updated:
Mar 21, 2023
|
Dr Gawad Physiology Course Online Exam - CVS - Course Lecture 1- Introduction, Rhythmicity,
11 MCQs (Only one correct answer)Each MCQ: 1 mark, Total mark: 11 (you will get your result immediately by the web)Allowed time: 10 minGood Luckdr Mohammed Abel Gawad
Questions:
11 |
Attempts:
560 |
Last updated:
Mar 21, 2023
|
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