Conduction system of the heart

The video explains the innervation of the heart by both sympathetic and parasympathetic systems. Sympathetic innervation increases heart rate and contraction force, originating from T1-T4 spinal levels. Parasympathetic innervation, via the vagus nerve from the medulla, decreases heart rate and contraction. The heart's conduction system, including the SA and AV nodes, coordinates muscle contraction. Visceral sensory neurons parallel these systems, mediating reflexes and pain perception.

What is the function of the vagus nerve in relation to the heart?

How does the heart's conduction system ensure coordinated contraction?

What is referred pain in the context of heart ischemia?