Use the diagram of an action potential to answer the following questions.

-The action potential shown is from

Question

Use the diagram of an action potential to answer the following questions.
 
-The action potential shown is from

Quizplus · Accepted Answer

[Chapter 3, III B; Figures 3.4 and 3.5]. The action potential shown is characteristic of ventricular muscle, with a stable resting membrane potential and a long plateau phase of almost $300 \mathrm{~ms}$. Action potentials in skeletal cells are much shorter (only a few milliseconds). Smooth muscle action potentials would be superimposed on fluctuating baseline potentials (slow waves). Sinoatrial (SA) cells of the heart have spontaneous depolarization (pacemaker activity) rather than a stable resting potential. Atrial muscle cells of the heart have a much shorter plateau phase and a much shorter overall duration.

Use the Diagram of an Action Potential to Answer the Following