March 01, 2019 The heart does more physical work than any other muscle in the body.The average heart pumps 2,000 gallons of blood per day!In a 70-year lifetime, an average human heart beats more than 2.5 billion times.Watch, Learn, and Live Librarycopyright American Hea
March 01, 2019 4 chambers of the heart: right atrium, right ventricle, left atrium, left ventricle.Watch, Learn, and Live Librarycopyright American Heart Association
