ilikeyourjacket t1_jdcqxv8 wrote on March 23, 2023 at 1:49 PM

Reply to comment by Jfrog1 in (Biology) How far down your spine can you break before respiratory impairment? by Anomaly-Friend

You’re right the ANS can influence heart rate but the heart itself has an intrinsic rate. The SA node has an intrinsic rate between 60-100bpm. The AV nice has an intrinsic rate of about 40-60bpm. The ventricles have an intrinsic rate of about 30bpm. That’s why in complete heart block often the heart rate is about 30bpm as that’s the default rate of the ventricles when signals from the SA or AV node are blocked.