The human heart is myogenic. Its circulatory system differs from those animals whose heart is nerogenic. In humans, the cardiac muscle contract spontaneously, that is, the heart contracts without needing any nervous input. Each electrical impulse to contract originates in muscle cells.
A neurogenic heart does require nervous input to contract: that is, a stimulus such as nerve innervation. In animals with an open circulatory system the sac-like or tubular heart has lateral openings which get closed when heart contracts and opens when heart relaxes. When the heart relaxes a vaccum is created to suck blood in the heart.