Human 8 Week Carnegie18
Female Reproductive System
Semen Contents in Glass Vial
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Left Breast with Cancer
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Embryo 44 Day Old Circulatory System
Silhouettes on a Beach Representing Stages of Life
Indirect Bilirubin Test for Anemia
Aorta and Heart with Thoracoabdominal Aortic Aneurysm
Pyramidal Neuron
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Heart, Front View
Because every cell in the body must have a never-ending supply of oxygenated blood, the heart never stops beating throughout a person's lifetime. It beats about 100,000 times a day, pumping 6 quarts of blood through the 65,000 miles of vessels that comprise the adult circulatory system, three times every minute.