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Describe the digestive tract
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Gut from mouth to anus. where food enters mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, and anus
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The accessory organs-- provide enzyme
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Salivary gland, liver, stomach, pancreas, gallbladder(stores enzyme,does not produce any)
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In mouth...
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Mechanical break down-> chemical break down of starch by smylase from salivary gland which also produce mucus
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After mouth...
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Push food mass to pharynx(voluntary) to esophagus(involuntary)
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Peristalsis
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Wavelike motion that move food along the digestive tract
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Sphincters
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Several points of the circular layer of muscle that thicken into heavy bands which acts as valves to control the passage of foot item
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In stomach
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Muscle bag, thick walls of epithelial, which has gastric pits, pores connect to gastric glands, produce HCL, mucus, pepsinogen
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Secretion of gastric juice
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Protein-containing food reaches stomach triggers the hormone, gastrine which acts on mucosa to increase secretion of gastric juice
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Small intestine***
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Digestion and absorption.duodenum keep digesting polysacchride;secret enzyme, aminopeptidase,enteropeptidase
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Pancrease
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Secrets digestive enzyme.alkaline fluid(nuetralize stomach acid)trypsin,chymotripsin,carboxypeptidase
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Liver
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Produce bile
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Gallbladder
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Stores bile(emulsify fats, break them into droplets)
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Enteropeptidase
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Directly, indirectly triggers activation of trypsinogen, procarboxypeptidase, chymotrypsinogen
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Absorption
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Nutrients are absorbed across the intestinal epithelium.(simple sugar enters blood stream by diffusion, others uses active transport)
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Absorption2
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Amino acid and sugars enters blood stream then to hepatic portal vessel to liver; chylomicrons enters lacteal
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