Ask unlimited questions for free
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.
The human body produces and destroys 15 million blood cells every second.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
For a complete list of videos, visit our video library