gastrointestinal tract morphological measurement gastrointestinal tract weight 2019-01-22T15:58:37Z CMO:0003016 Measurement of the weight or heaviness of the gastrointestinal tract, that is, the degree to which it is drawn toward the earth by gravity. The gastrointestinal tract is an organ system within humans and other animals which takes in food, digests it to extract and absorb energy and nutrients, and expels the remaining waste as feces. The mouth, esophagus, stomach and intestines are part of the gastrointestinal tract. VT:0010196 clinical_measurement_ontology sjwang