Which cells secrete gastrin and in which parts of GIT are they found? 2. Which cells secrete cholecystokinin and where are they found. What does CCK do? 3. Which cells secrete secretin, where are they, what does it do? 4. Which cells secrete motilin, where are they, what does it do? 5. Which cells make gastric inhibitory polypeptide, where are they found, what do they do?

The gastrointestinal tract (GIT) is the system of organs that allows for the consumption and digestion of food, absorption of nutrients, and excretion of waste in the form of fecal matter.