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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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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.
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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.