|
|
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.
The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.
![Defensive mutualism involves species that receive food or shelter in return for providing protection](https://biology-forums.com/gallery/47/medium_33_02_08_11_9_30_09_14152242.jpeg)
![One target for expanding medical services involves vaccinations. Only 78 percent of children ages 19 ...](https://biology-forums.com/gallery/47/medium_667187_21_02_17_5_23_23_25607561.png)