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10 Cards in this Set

  • Front
  • Back
breakdown and absorption of nutrients
the main function of the digestive system
ingestion
Entrance of nutrients into digestive tract
mechanical processing
Physical processing of materials entering digestive tract
digestion
Chemical breakdown of food into smaller organic molecules
secretion
Release of water, acids, enzymes, buffers, salts
absorption
Movement of organic molecules from digestive tract into interstitial fluid of digestive tract
excretion
Elimination of waste products from digestive tract (defecation)
carbohydrates
-Mono-, di-, poly- saccharides
Starch, sugars
-Primary source for energy
-Broken down into glucose for use in cellular respiration to obtain ATP
-4 calories / gram
-glycogen
-cellulose
lipids
-Fatty acids, mono-, triglycerides, steroids
Fats, oils, waxes
-Shock absorber
proteins
Polypeptides made of amino acids
-20 amino acids
-8 essential, 12 nonessential
-antibodies
-enzymes
4/per gram