Cardiac Conduction System and Cardiac Muscle

Nerve Supply to the Heart

Sympathetic stimulation, Parasympathetic stimulation, and Internal Pacemaker (nerves do not make heart beat, they MODIFY the heart beat ((speed up or slow down)))

Innervate coronary arteries

Dilate arteries, increasing coronary blood flow

Parasympathetic stimulation is controlled by

Vagus nerve 10

Vagus nerve 10 lowers heart rate bc

Acetylcholine is released, it raises the permeability of potassium (K), making it easier for K to leave the box, more (+) leaving the box means more (-) aka hyperpolarization RMP even more (-)