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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.
You should not take more than 1,000 mg of vitamin E per day. Doses above this amount increase the risk of bleeding problems that can lead to a stroke.
There are major differences in the metabolism of morphine and the illegal drug heroin. Morphine mostly produces its CNS effects through m-receptors, and at k- and d-receptors. Heroin has a slight affinity for opiate receptors. Most of its actions are due to metabolism to active metabolites (6-acetylmorphine, morphine, and morphine-6-glucuronide).
The top five reasons that children stay home from school are as follows: colds, stomach flu (gastroenteritis), ear infection (otitis media), pink eye (conjunctivitis), and sore throat.
The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
![Continued harvest of (a) cod and (b) mountain sheep by humans has caused evolutionary changes in mat](https://biology-forums.com/gallery/47/medium_33_31_08_11_2_20_49_16361410.jpeg)
![(A) The male pelvis (android) is shaped like a funnel, forming a narrower outlet than the female. (B](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_41_29_89611962.jpeg)