The 500 Dalton rule for the skin penetration of chemical compounds and drugs.
Longest cave penetration dive [DPV]
Jill Heinerth Canada made a 3, m 10, ft cave penetration at a depth of 91 m ft during a science and mapping dive at Wakulla Springs in The dive included 5 hours at 91 m ft followed by 16 hours of decompression. Photo by Wes Skiles courtesy U. Deep Caving Team. Jeffrey started diving in
Human skin has unique properties of which functioning as a physicochemical barrier is one of the most apparent. The human integument is able to resist the penetration of many molecules. However, especially smaller molecules can surpass transcutaneously. They are able to go by the corneal layer, which is thought to form the main deterrent. We argue that the molecular weight MW of a compound must be under Dalton to allow skin absorption.
The human anus is the external opening of the rectum. Two sphincters control the exit of feces.. We tapped an expert to get the bottom of anal sex so you can too! An obvious fear about anal pentration is that it'll be painful to insert something as big..