A Physiologist Is Trying to Study the Cardiac Action Potential

question 316

Multiple Choice

A physiologist is trying to study the cardiac action potential. He takes the reading from 4 different points within normal cardiac tissue. The results, expressed in terms of speed of conduction (meters per second) , are as follows:Point 1 - 0.05 m/sec Point 2 - 0.3 m/sec
Point 3 - 1.1 m/sec
Point 4 - 2.2 m/secFrom the following list of locations, which most likely corresponds to the order of points 1-2-3-4 (AV = atrioventricular) ?

• A)Atrial muscle, ventricular muscle, Purkinje system, AV node
• B)AV node, Purkinje system, ventricular muscle, atrial muscle
• C)AV node, ventricular muscle, atrial muscle, Purkinje system
• D)Purkinje system, AV node, ventricular muscle, atrial muscle
• E)Ventricular muscle, AV node, Purkinje system, atrial muscle

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