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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.
Though methadone is often used to treat dependency on other opioids, the drug itself can be abused. Crushing or snorting methadone can achieve the opiate "rush" desired by addicts. Improper use such as these can lead to a dangerous dependency on methadone. This drug now accounts for nearly one-third of opioid-related deaths.
The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
Despite claims by manufacturers, the supplement known as Ginkgo biloba was shown in a study of more than 3,000 participants to be ineffective in reducing development of dementia and Alzheimer’s disease in older people.
![Arthroscopic surgery involves the surgery of a joint with the use of a flexible arthroscope and othe](https://biology-forums.com/gallery/47/medium_14755_24_09_12_7_49_32_89872018.jpeg)
![The thorax of apes, including humans, is broad but shallow in contrast to the narrower, deeper chest](https://biology-forums.com/gallery/47/medium_274477_04_02_15_12_29_07_20601601.jpeg)