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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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There are more bacteria in your mouth than there are people in the world.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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There are more nerve cells in one human brain than there are stars in the Milky Way.