THINKING QUESTION :
When you get a tattoo*, would you expect the ink to be injected into the epithelial layer of your skin or into the connective tissue layer? Why?
* A tattoo is permanent ink that is implanted into the skin. The ancient Polynesians and Japanese used handheld bamboo shoots and needle clusters to accomplish this. Today, a tattoo machine is typically employed for this manner. The machine works by means of a reciprocating motor that punctures the skin between 0.6 millimeters and 2.2 millimeters. The ink particles diffuse into the tissues where they are absorbed.