|
|
There are 60,000 miles of blood vessels in every adult human.
The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
![Intradermal drug administration: (a) cross section of skin showing depth of needle insertion Source:](https://biology-forums.com/gallery/47/medium_46687_08_12_14_4_59_34_19526512.jpeg)
![Plasma protein binding and drug availability: (a) The drug exists in a free state or is bound to ...](https://biology-forums.com/gallery/28/medium_482573_25_04_17_9_15_17_283522000.jpeg)
![The relation between drug tolerance and withdrawal effects. The same adaptive neurophysiological ...](https://biology-forums.com/gallery/30/medium_548020_07_06_17_9_28_56_3044430.png)