The pacemaker cells of sinoatrial node (SA node) are inhibited by the stimulation of vagus nerve. The probable mechanisms of this inhibition are stated as follows: + A. The acetylcholine- regulated K channels are activated + B. The outward K causes hyper polarization of pacemaker cells C. The inward “funny current” of pacemaker potential is increased 2+ D. The increased intracellular cAMP, induced by activation of M muscarinic receptors, slows the opening of Ca channels 2 Choose the answer with correct statements.
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