LIFESCI 2N03 Lecture Notes - Lecture 3: Galactose, Wheat Allergy, Blood Test
7 Oct 2013
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Two main groups: alimentary canal, gastrointestinal tract, continuous digestive tube through whole body, function, digestion breaks food into smaller fragments so that body can absorb nutrients. Protein amino acids: absorption moves the digested fragments from the alimentary canal into the blood, anatomical structure. Mouth (lips, cheeks, palate, tongue, teeth, salivary glands) more digestion than absorption. Large intestine (cecum, ascending colon, transverse colon, descending colon, sigmoid colon, return, anal. Stomach (cardiac orifice, fundus, body, pyloric canal, pylorus, pyloric sphincter, omentum) Small intestine (duodenum, jejunum, ileum) absorb vast majority of macronutrients canal: accessory digestive organs assists alimentary canal in digestion. Considered to be outside the body (still in external environment: teeth, tongue, gallbladder, liver, pancreas, figure: digestive system anatomy. Ingestion physically taking food into the digestive system: propulsion moving food through the alimentary canal, swallowing voluntary activity moving food down the esophagus, peristalsis. Involuntary movement of food through the esophagus, stomach and intestine: muscular action; controlled by nervous system.
