sinoatrial node cells: a. exhibit spontaneous depolarization that is speeded by

Question

sinoatrial node cells:

a. exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors
b. are in between atrial muscle cells and cells of bundle of His.
c. exhibit a steep up stroke due to the pressure of the same type of na+ channels found in neuronal membranes
d. reach threshold only when action potentials generated by the AV node arrive through Gap Junctions.
e. exhibit spontaneous depolarization that is speeded by activation of their beta adreneric receptors

Explanation / Answer

The sinoatrial node cells exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors. The parasympathetic nervous system stimulation decreases heart rate. That is the acetylcholine acts on M2 receptors in the SA nodal cells exhibit spontaneous depolarization.

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