six essential activities of the digestive system
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mechanical breakdown
chewing, mixing food with saliva (bolus), churning food in stomach (chyme), segmentation
propulsion
movement of food through alimentary canal
absorption
passage of digested fragments from lumen of GI tract into blood or lymph
digestion
series of catabolic steps that involves enzymes that break down complex food molecules into chemical building blocks
ingestion
eating
defacation
elimination of indigestible substances via anus in form of feces