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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
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.
Did you know?
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Did you know?
Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.
Did you know?
The average office desk has 400 times more bacteria on it than a toilet.