When exercising the sympathetic nervous system stimulates the sinoatrial and atrioventricular nodes. The cardiac accelerator nerve connects the sympathetic fibres in the medulla of the brain to the sinoatrial node in the heart via, the vagus nerve; and innervates both the sinoatrial
When exercising the sympathetic nervous system stimulates the sinoatrial and atrioventricular nodes. The cardiac accelerator nerve connects the sympathetic fibres in the medulla of the brain to the sinoatrial node in the heart via, the vagus nerve; and innervates both the sinoatrial