May require a bachelor's degree in engineering and 0-3 years of experience in the field or in a related area. Has knowledge of commonly-used concepts, practices, and procedures within a particular field. Relies on instructions and pre-established guidelines to perform the functions of the job.
1 Bile contains bile acids, which are critical for digestion and absorption of fats and fat-soluble vitamins in the small intestine. 2  Many waste products, including bilirubin, are eliminated from the body by secretion into bile and elimination in feces.
There are various accessory organs that assist the tract by secreting enzymes to help break down food into its component nutrients. Thus the salivary glands, liver, pancreas and gall bladder have important functions in the digestive system. Food is propelled along the length of the GIT by peristaltic movements of the muscular walls.