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The familiar sounds of your heart are made by the heart's valves as they open and close.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
Vital signs (blood pressure, temperature, pulse rate, respiration rate) should be taken before any drug administration. Patients should be informed not to use tobacco or caffeine at least 30 minutes before their appointment.