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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.
Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
![Traction is the application of a pulling force to maintain bone alignment during fracture healing. D](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_49_31_8986303.jpeg)
![skeletal muscle consists of a group of fibers held together by connective tissue. It is enclosed in ...](https://biology-forums.com/gallery/47/medium_665046_01_03_17_9_12_00_261871967.jpeg)