The heart is a myogenic muscle body organ discovered in all animals with a blood circulation technique (providing all vertebrates), which pumps blood throughout the blood vessels by duplicated, rhythmic contractions. The terminology cardiac (as in cardiology) indicates "related to the heart" as well as comes from the Greek, for "heart". The vertebrate heart is principally made up of cardiac muscular tissue and also connective muscle.

Cardiac muscular tissue is an uncontrolled striated muscle tissue discovered merely in this organ and also accountable for the ability of the heart to pump blood. The typical human heart, topping at 72 beats every minute, are going to defeat approximately 2.5 billion times during an average 66 year life-span. It examines approximately 250 to 300 grams (9 to 11 oz) in girls and also 300 to 350 grams (11 to 12 oz) in guys.