Which statement is true regarding the electrical activity in the heart? A) Purkinje fibers have the slowest conduction speed B) AV nodal fibers depolarize faster than Ventricular m... Which statement is true regarding the electrical activity in the heart? A) Purkinje fibers have the slowest conduction speed B) AV nodal fibers depolarize faster than Ventricular muscle fibers C) Ventricular muscle fibers have a less negative resting potential than Purkinje fibers D) The AV node acts as the primary pacemaker of the heart
Understand the Problem
The question is asking which statement about the electrical activity in the heart is true. It involves understanding the conduction system of the heart, including the roles of Purkinje fibers, AV node, and ventricular muscle fibers.
Answer
Ventricular muscle fibers have a less negative resting potential than Purkinje fibers.
C) Ventricular muscle fibers have a less negative resting potential than Purkinje fibers
Answer for screen readers
C) Ventricular muscle fibers have a less negative resting potential than Purkinje fibers
More Information
Ventricular muscle fibers exhibit a less negative resting potential compared to Purkinje fibers. This distinction is due to the different ionic mechanisms and functions these fibers hold within the cardiac conduction system.
Tips
A common misconception is assuming that conduction speed directly correlates with negativity of resting potential or depolarization rate.
Sources
- Key Concept: There are two types of action potentials in the heart. - justintimemedicine.com
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