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Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Excessive alcohol use costs the country approximately $235 billion every year.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.