Ask unlimited questions for free
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
The horizontal fraction bar was introduced by the Arabs.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
For a complete list of videos, visit our video library