Heart produce two types of hormones: ANP and BNP (A and B type natriuretic peptide), they also limit fibrosis and hypertrophy. BNP can be used as drug in the treatment of acute heart failure.
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Normal impulse conduction
the heart is in the circulatory system.
Veins and arteries are in the circulatory system. Therefore that means they have something to do with pumping blood to cells around the body. So I would say that the role the arteries play in the body is that it carries blood to and from the heart to other parts of the body
Circulatory system and Cardiovascular system
The cardiac conduction system is the conducting system of the heart.