|
|
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.
Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
![A DC voltage is applied across the spark plug gap after the plug fires and the circuit can determine ...](https://biology-forums.com/gallery/29/medium_548020_30_05_17_6_52_57_29826391.png)
![The default position for the throttle plate is in slightly open position. The servomotor then is ...](https://biology-forums.com/gallery/30/medium_548020_31_05_17_2_04_53_300292042.png)