Ask unlimited questions for free
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Amphetamine poisoning can cause intravascular coagulation, circulatory collapse, rhabdomyolysis, ischemic colitis, acute psychosis, hyperthermia, respiratory distress syndrome, and pericarditis.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
For a complete list of videos, visit our video library