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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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Complications of influenza include: bacterial pneumonia, ear and sinus infections, dehydration, and worsening of chronic conditions such as asthma, congestive heart failure, or diabetes.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.