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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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Excessive alcohol use costs the country approximately $235 billion every year.