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The familiar sounds of your heart are made by the heart's valves as they open and close.
The human body produces and destroys 15 million blood cells every second.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
Hypertension is a silent killer because it is deadly and has no significant early symptoms. The danger from hypertension is the extra load on the heart, which can lead to hypertensive heart disease and kidney damage. This occurs without any major symptoms until the high blood pressure becomes extreme. Regular blood pressure checks are an important method of catching hypertension before it can kill you.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.