Drug Absorption | Cannabis Wiki
Drug absorption refers to drugs that are usually administered distant to their site of action in the body. They must then pass across cell-membranes to reach their site of action.
Example: Drugs that are given by mouth must pass across the gut membrane to enter the blood stream and then pass through the endothelium of vessel walls to reach the site of action in the tissues. This process is called absorption and may depend on lipid diffusion, aqueous diffusion, active transport, or pinocytosis-which is a process in which a cell takes in small droplets of fluid by cystoplasmic engulfment.