The four chambers in the human heart that pump blood are comprised of two atria and two ventricles. The body returns unoxygenated blood to the right ventricle, via the right atrium, which pumps blood through the lungs where it is reoxygenated. The oxygenated blood is then pumped to the left ventricle, via the left atrium, where it is pumped throughout the body.
The left ventricle has the bigger job because it pumps the oxygenated blood throughout the entire body.
By the time a person reaches 18 years of age their heart
will have beat an average of 709,560,000 times.
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