|
Author Question: A string of twelve holiday lamps is designed to be connected in series to a 120-V source. If one of ... (Read 454 times) |
Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.