Sinoatrial node cells
A. exhibit spontaneous depolarization that is speeded by activation of their beta-adrenergic receptors.
B. reach threshold only when action potentials generated by the AV node arrive through gap junctions.
C. are between atrial muscle cells and cells of the bundle of His.
D. exhibit spontaneous depolarization that is speeded by activation of their cholinergic receptors.
E. exhibit a steep upstroke due to the presence of the same type of Na+ channels found in neuronal membranes.
Answer: A
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