Final answer:
The abbreviation 'G' stands for 'Gastrointestinal,' which refers to the digestive system, specifically the GI tract where digestion and nutrient absorption occur.
Step-by-step explanation:
The abbreviation that stands for the digestive system is 'G', which is a reference to the gastrointestinal tract, commonly abbreviated as 'GI tract'.
The GI tract is a series of organs including the mouth, esophagus, stomach, small intestine, and large intestine through which food passes, gets digested, its nutrients absorbed, and waste expelled. Along with these, the pancreas, liver, and gallbladder are accessory digestive organs that assist in digestion. The term 'gastrointestinal' is derived from 'gastro' meaning stomach and 'intestinal' referring to the intestines.