Lecture 27st Wed Apri 2 Nutrition part 2

Lecture 27st Wed Apri 2 Nutrition part 2 - LECTURE 27:...

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lecture 27 LECTURE 27: Nutrition part 2 Biology 61 Wed April 2
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lecture 27 Announcements Ch 41 841-8 62, Ch 42 871-883, 886- 895 Email addresses for Dent school About the growth of bones Big Ideas Prac Prob Set 3B out today Exam in 9 DAYS
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lecture 27 RECAP DIGESTIVE TRACT:One long tube with accessory digestive organs hooked on to help Organ route: mouth, pharynx, esophagus, stomach, small intestine, large intestine, rectum, anus My pop eats some small and large red ants Accessory digestive organs—hooked into “tube” Salivary glands-secrete amylase for carb digestion Liver: makes bile which emulsifies fat Gall bladder: stores bile Pancreas: produces digestive enzymes/ bicarbonate
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lecture 27 IIeum of small intestine Duodenum of small intestine Appendix Cecum Ascending portion of large intestine Anus Small intestine Large intestine Rectum Liver Gall- bladder Tongue Oral cavity MOUTH Pharynx Esophagus Stomach Pyloric sphincte r Cardiac orifice/sphincter Mouth Esophagus Salivary glands Stomach Liver Pancreas Gall- bladder Large intestines Small intestines Rectum Anus Parotid gland Sublingual gland Submandibular gland Salivary glands A schematic diagram of the human digestive system Figure 41.15 The human digestive system Pancreas
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lecture 27 Common themes of digestion Maximize surface area between food and body components Hokey-legos Doors between one organ and next (ex sphincters) to control passage Enzymes should not cause autodigestion
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lecture 27 Mouth Teeth: mechanical disassembly Front teeth (canines and incisors): pointy for tearing and cutting Back teeth (premolars/ molars): flattened and ridged for grinding Saliva from salivary gland (tissue?) Mucin (glycoprotein): protects mouth from abrasion, lubricates food Salivary amylase (enzyme): hydrolyzes starch/glycogen into smaller polysacc/maltose –enzymatic digestion begins Bolus: ball of food
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lecture 27 Pharynx Pharynx (throat): junction of both trachea and esophagus-upside down Y When not swallowing, esophageal sphincter muscles are contracted and the glottis is uncovered, allowing airflow to the lungs During swallowing, food is prevented from entering the trachea glotis by elevation of the windpipe against the epiglottis (lid), esophageal sphincter opens
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lecture 27 Esophagus Tongue Pharynx Glottis Larynx Trachea Bolus of food Epiglottis up To lungs To stomach Esophageal sphincter contracted Figure 41.16 From mouth to stomach: the swallowing reflex and esophageal peristalsis (layer 1)
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lecture 27 Figure 41.16 From mouth to stomach: the swallowing reflex and esophageal peristalsis (layer 2) Esophagus Epiglottis down Tongue Pharynx Glottis Larynx Trachea Bolus of food Epiglottis up To lungs To stomach Esophageal sphincter contracted Tracheal glottis up and closed Esophageal sphincter relaxed
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lecture 27 Esophagus Conducts food from the pharynx (past esophageal sphincter) down to the stomach Skeletal muscle at top of esophagus are under
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Lecture 27st Wed Apri 2 Nutrition part 2 - LECTURE 27:...

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