STUDY GUIDE LECTURES 1-12

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25 Sep 2013
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Answers to Study Guide Questions: Lecture 1-12 (2013)
Lecture 1: Electrical Conduction within the Heart
Which changes in ionic conductance (permeability) accompany the various phases of the pacemaker
potential?
a) In zone 1, a decrease in PK and an increase in PNa: In zone 2, an increase in PCa
b) In zone 1, a decrease in PK and an increase in PCa: In zone 2, an increase in PNa
c) In zone 3, a large increase in PNa: In zone 4, an increase in PK and a decrease in PCa
d) In zone 3, a large increase in PCa: In zone 4, an increase in PK and a decrease in PNa
e) A and D
The action potential that travels along the conduction pathway of the heart moves upward into the
ventricles (from the apex of the heart) via the ?
a) AV node
b) SA node
c) Purkinje Fibres
d) Atrioventricular valves
e) Bundle of His
1. 2.
3.
4.
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Lecture 2: Cardiac Action Potential and the Electrocardiogram
Which changes in ionic conductance (permeability) DO NOT accompany the various phases of the
cardiac action potential?
a) In zone 0, an increase in PNa
b) In zone 1, a decrease in PNa, a decrease in PK and an increase in PCa
c) In zone 2, a decrease in PNa and an increase in PCa
d) In zone 3, an increase in PK and a decrease in PCa
e) C and D
The P and T waves of the ECG represent and , respectively.
a) Ventricular repolarisation and atrial depolarisation.
b) Atrial depolarisation and atrial repolarisation.
c) Ventricular depolarisation and atrial repolarisation.
d) Atrial depolarisation and ventricular repolarisation.
e) Atrial depolarisation and ventricular depolarisation.
The following ECG trace is representative of what cardiac disorder?
a) Atrial flutter.
b) Atrial fibrillation.
c) Ventricular fibrillation.
d) Wandering atrial pacemaker.
e) Second degree heart block.
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Lecture 3: ECGs, Electrical Axis of the Heart and the Cardiac Cycle
In order for both of the semilunar valves to be open:
a) P (pulmonary artery) < P (right ventricle) and P (aorta) > P (left ventricle)
b) P (pulmonary artery) < P (right ventricle) and P (aorta) < P (left ventricle)
c) P (right ventricle) = P (aorta) and P (left ventricle) = P (pulmonary artery)
d) P (pulmonary artery) > P (right ventricle) and P (aorta) > P (left ventricle)
e) P (pulmonary artery) > P (right ventricle) and P (aorta) < P left ventricle
During Iso-volumetric contraction of the heart:
a) There is an increase in pressure without a change in volume.
b) The semilunar valves are closed.
c) The AV valves are closed
d) A and B
e) A, B and C
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Document Summary

Answers to study guide questions: lecture 1-12 (2013) The action potential that travels along the conduction pathway of the heart moves upward into the ventricles (from the apex of the heart) via the : av node, sa node, purkinje fibres, atrioventricular valves, bundle of his. Lecture 2: cardiac action potential and the electrocardiogram. The p and t waves of the ecg represent and , respectively: ventricular repolarisation and atrial depolarisation, atrial depolarisation and atrial repolarisation, ventricular depolarisation and atrial repolarisation, atrial depolarisation and ventricular repolarisation, atrial depolarisation and ventricular depolarisation. The following ecg trace is representative of what cardiac disorder: atrial flutter, atrial fibrillation, ventricular fibrillation, wandering atrial pacemaker, second degree heart block. Lecture 3: ecgs, electrical axis of the heart and the cardiac cycle. During iso-volumetric contraction of the heart: there is an increase in pressure without a change in volume, the semilunar valves are closed, the av valves are closed, a and b, a, b and c.

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