The parasympathetic ganglionic synapses for the heart located within the heart itself.
The heart has inside terminal ganglia rather than a distinct ganglion, like many other effectors do. The parasympathetic nervous system operates in reverse to lower heart rate. The sinoatrial node, the heart's own internal pacemaker, does not require a neurological system to function. The heart will continue to beat even if all of its nerves are severed. In fact, it will beat more quickly than usual because the heart is often slowed by a parasympathetic supply. The hormone acetylcholine is released by the parasympathetic nervous system (PNS) to reduce the heart rate. Your heart rate may briefly increase due to stress, coffee, and excitement, whereas it may temporarily decrease due to meditation or deep, steady breathing.
Hence, heart-specific parasympathetic ganglionic synapses are found within the heart tissue.
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