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Did you know?
There are 60,000 miles of blood vessels in every adult human.
Did you know?
The horizontal fraction bar was introduced by the Arabs.
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?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Did you know?
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.