If it doesn’t give you answer choices then I’m guessing it’s exercise
The slowest drug absorption/response is definitely oral/digestion route.
The fastest drug response time route would be intravenous, the drugs directly enter the blood so it can work instantly. Snorting/inhaling drug still need time to be absorbed to the blood vessel. It might be fast enough if used for local response (example: asthma). The mechanism probably by mucosa diffusion so its similar to rectal or sublingual route.
There are several sphincters that appear along the gastrointestinal tract in the human body. The sphincters are; upper esophageal, lower esophageal, pyloric, ileocaecal, and the inner and outer anal sphincters.
