Is a fish's digestive system intracellular or extracellular?

Answer 1

A bony fish's digestive system is an extracellular process - the food in ingested, taken into the stomach where acid and compression works to break it down. It then transits into the intestinal system where it is completely broken down and the nutrients absorbed into the blood stream. At this point the nutrients will go from extracellular to intracellular as they are absorbed by the body tissues from the blood stream.