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What ions are involved in smooth muscle action potentials (I'm talking about like the graph you see. For example, for nerve cells, you have Na+ and K+ channels)?
From this website(https://www.inkling.com/read/medical-physiology-boron-boulpaep-2nd/chapter-9/smooth-muscle) it seems like Ca2+ and K+ channels are involved.
This would make sense since Ca2+ channels are slow (and smooth muscle contractions are slow).
But my TPR book says the "upstroke of the action potential" comes from Na+.
From this website(https://www.inkling.com/read/medical-physiology-boron-boulpaep-2nd/chapter-9/smooth-muscle) it seems like Ca2+ and K+ channels are involved.
This would make sense since Ca2+ channels are slow (and smooth muscle contractions are slow).
But my TPR book says the "upstroke of the action potential" comes from Na+.
