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The familiar sounds of your heart are made by the heart's valves as they open and close.
Blood is approximately twice as thick as water because of the cells and other components found in it.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.


