The parasympathetic nervous system slows heart rate by releasing ACh, which increases outward K+ current, decreasing the rate of pacemaker potentials and thus the heart rate.
1. ACh from parasympathetic innervation (vagus nerve) decreases rate of pacemaker potentials by <b>increasing outward K</b> 2. Leads to less frequent AP which slows HR <img src="paste-8ea5c67295675ed4678670807b6b19ee27a546c8.jpg">
| Front | What type of ion channel is used by the parasympathetic branch to slow down HR? |
|---|---|
| Back | 1. ACh from parasympathetic innervation (vagus nerve) decreases rate of pacemaker potentials by increasing outward K 2. Leads to less frequent AP which slows HR |
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