Various regions of the [[Alimentary - Anatomy & Physiology|Alimentary Tract]] secrete [[Endocrine System - Hormones - Anatomy & Physiology|hormones]] which have various functions within the gastrointestinal tract itself, plus the [[Liver - Anatomy & Physiology|liver]], [[Gall Bladder - Anatomy & Physiology|gall bladder]] and [[Pancreas - Anatomy & Physiology| | Various regions of the [[Alimentary - Anatomy & Physiology|Alimentary Tract]] secrete [[Endocrine System - Hormones - Anatomy & Physiology|hormones]] which have various functions within the gastrointestinal tract itself, plus the [[Liver - Anatomy & Physiology|liver]], [[Gall Bladder - Anatomy & Physiology|gall bladder]] and [[Pancreas - Anatomy & Physiology| |