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Did you know?
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The average adult has about 21 square feet of skin.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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