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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.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.
![The medical assistant holds the position of the thermometer while the temperature is being obtained.](https://biology-forums.com/gallery/47/medium_665046_06_03_17_1_45_26_262972351.jpeg)
![The major components of the hippocampus: CA1, CA2, CA3, and CA4 subfields and the dentate gyrus. ...](https://biology-forums.com/gallery/30/medium_548020_06_06_17_12_41_59_303531833.png)