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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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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.