THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -Your vagus nerve-which goes from your brainstem to your belly-plays a major role in your parasympathetic nervous system, which controls a number of things in your body, including heart rate.

Detailed explanation-2: -The vagus nerve signals to the heart via the intracardiac ganglia, with the atria extensively innervated by parasympathetic vagal nerves (Sanchis-Gomar et al. 2016). It has been hypothesized that VNS might modulate atrial electrophysiological properties because of this innervation (Chen and Tan 2007).

Detailed explanation-3: -The higher the vagus nerve activity is, the slower the heart rate is, the greater the increase in the parasympathetic component of heart rate variability is, and the better the outcome is.

Detailed explanation-4: -Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines-epinephrine and norepinephrine) to accelerate the heart rate.