What do pacemaker cell action potentials lack?
Understand the Problem
The question is asking about the specific characteristics of pacemaker cell action potentials, particularly what they do not possess compared to other cell types. This involves understanding the unique features of pacemaker cells in the heart.
Answer
A rapid, phase 0 depolarization
Pacemaker cell action potentials lack a rapid, phase 0 depolarization.
Answer for screen readers
Pacemaker cell action potentials lack a rapid, phase 0 depolarization.
More Information
Pacemaker cells have slow action potentials due to the absence of rapid sodium influx, primarily utilizing slower calcium channels for depolarization.
Tips
Common mistakes include confusing pacemaker cells with regular myocardial cells, which have a rapid, phase 0 depolarization due to fast sodium influx.
Sources
- Pacemaker Potential - ScienceDirect - sciencedirect.com
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