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Published byLee Thornton Modified over 9 years ago
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Digestive System
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Digestion Introduction Physical Digestion Chemical Digestion Hepatic Portal System
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Digestive System: Overview Figure 24.1
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Digestive Process Figure 24.2
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Figure 15.3
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Essential Activities of Digestion Figure 24.3a, b
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Digestive Process Figure 24.2
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Mouth & Tongue Figure 24.7a
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Salivary Glands II Figure 24.9a
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Teeth Figure 24.10.2
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Digestive Processes in the Mouth Food is ingested Mechanical digestion begins mastication Propulsion is initiated by swallowing Salivary amylase
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Deglutition (Swallowing) Figure 24.13a-c
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Thought Question
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Esophagus Figure 24.13d, e
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Stomach Figure 24.14a
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Figure 15.17
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Thought Question
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Regulation of Gastric Secretion Stimulatory and inhibitory events occur in three phases – Cephalic (reflex) phase – Gastric phase – Intestinal phase
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Cephalic Phase Excitatory events include: Inhibitory events include: Inputs come from olfactory receptors and taste buds hypothalamus vagal nuclei parasympathetic ganglion
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Gastric Phase Excitatory events include: Inhibitory events include: Chemicals released – Gastrin – Ach – Histamine
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Regulation and Mechanism of HCl Secretion Figure 24.17
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Gastric Contractile Activity Figure 24.18
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Intestinal Phase Excitatory phase Inhibitory phase
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Regulation of Gastric Emptying Figure 24.19
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Microscopic Anatomy of the Small Intestine Figure 24.21a-c
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Figure 15.8
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Figure 15.27
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Figure 15.32
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Figure 15.7
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Large Intestine Figure 24.29a
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Chemical Digestion Carbohydrates
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Figure 15.7
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Chemical Digestion Protein Stomach – Pepsinogen Pepsin Small Intestine – Trypsin, Chymotrypsin, Carboxypeptidase – Brush Border Enzymes – Aminopeptidases – Carboxypeptidases
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Thought Question
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Figure 15.7
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Chemical Digestion: Nucleic Acids Hydrolyzed to their nucleotide monomers by pancreatic nucleases present in pancreatic juice Absorption: active transport via membrane carriers – Absorbed in villi and transported to liver via hepatic portal vein Enzymes used: pancreatic ribonucleases and deoxyribonuclease in the small intestines
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Chemical Digestion of Fats
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Figure 15.9
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Figure 15.10
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Figure 15.11
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Fatty Acid Absorption Figure 24.36
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Pancreatic Enzymes
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Hepatic Portal System
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Thought Question
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Summary Introduction Physical Digestion Chemical Digestion Hepatic Portal System
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