Human Circulatory System and Heart Physiology

Afferent fibres carrying pain sensation run to the spinal cord.

During rest, the vagal tone is recessive.

Postganglionic fibres descend to the heart and form two plexuses.

The effects of autonomic nervous system on coronary artery and blood flow are reciprocal.

Preganglionic sympathetic fibres ascend from the upper five thoracic segments of the spinal cord.