|
|
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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).
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.
![Prevalence of Diabetes in the United States Based on Age and Sex Data from the American Diabetes ...](https://biology-forums.com/gallery/47/medium_667187_23_02_17_9_54_05_25735955.jpeg)
![This mural depicts the history of Mexico and its struggles to create a just society in the face of ...](https://biology-forums.com/gallery/47/medium_660366_21_03_17_2_36_59_27295123.jpeg)