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Did you know?
Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
Did you know?
Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
Did you know?
Thyroid conditions may make getting pregnant impossible.
Did you know?
The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
Did you know?
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
![Paland and Lynch demonstrated the importance of sexual reproduction in reducing the frequency of mal](https://biology-forums.com/gallery/47/medium_33_01_08_11_10_39_57_1284692.jpeg)
![A client is having an endoscopy performed by a physician who views the upper gastrointestinal intern](https://biology-forums.com/gallery/47/medium_18099_24_10_12_4_35_00.jpeg)