The Human Heart Has Four Chambers
Two upper atria receive blood and two lower ventricles pump it out.
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Arteries Carry Blood Away From the Heart
Veins carry blood back, though the pulmonary artery and vein are exceptions to the oxygen rule.
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The Heart Begins to Beat About Three Weeks After Conception
It is among the first organs to function.
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The Average Adult Has About Five Liters of Blood
The blood makes a full trip around the body in about a minute.
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Blood Pressure Is Measured as Two Numbers
The first is the pressure when the heart beats and the second is the pressure between beats.