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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
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On increasing vagal tone following occurs in pacemaker
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The correct answer is  When the cholinergic vagal fibers to nodal tissue are stimulated, the membrane becomes hyperpolarizedThe slope of the prepotentials is decreased because the acetylcholine released at the nerve endings increases the K+ conductance of nodal tissue.Which cause rapid efflux of K+Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 491