RUSSEL-lecture14-digestion_metabolism

RUSSEL-lecture14-digestion_metabolism - Anatomy of the...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Anatomy of the digestive system Can be divided into the alimentary canal (GI tract) and accessory organs Alimentary canal Mouth The mouth Food breakdown begins in the mouth by being chewed and mixed with saliva Alimentary canal Mouth Pharynx The pharynx Divided into nasopharynx, oropharynx, laryngopharynx Walls contain one circular and one longitudinal layer of skeletal muscle--this assists with peristalsis Alimentary canal Mouth Pharynx Esophagus The esophagus Alimentary canal Mouth Pharynx Esophagus Stomach The stomach Holding it all in place What it does After food is processed in the stomach, it resembles a heavy cream, called chyme , which enters the small intestine Alimentary canal Mouth Pharynx Esophagus Stomach Small intestine The small intestine 3 subdivisions: duodenum (5%), jejunum (40%), ileum (60%) Pyloric sphincter controls entry of food into small intestine Duodenum contains pancreatic and bile ducts Small intestine is the site of almost all nutrient absorption Villi/microvilli increase surface area massively Villi/microvilli Alimentary canal Mouth Pharynx Esophagus Stomach Small intestine Large intestine The large intestine Alimentary canal Mouth Pharynx Esophagus Stomach Small intestine Large intestine Anus Accessory organs Salivary glands Salivary glands Two main sets: parotid glands, submandibular glands Saliva has several main functions: moisten food and bind it together into a bolus (lubricates food) start process of digestion with salivary amylase contains lysozyme and antibodies assists with taste by dissolving food chemicals Accessory organs Salivary glands Teeth Mechanical breakdown of food Two sets of teeth: deciduous (= baby, milk) and permanent Teeth Accessory organs Salivary glands Teeth Pancreas Pancreas Secretes enzymes to break down all of your food Accessory organs Salivary glands Teeth Pancreas Liver and gallbladder The liver produces bile , which enters the duodenum and emulsifies fats--breaks down large fat globules into small ones The gall bladder stores bile when digestion is not taking place Liver and gallbladder Ingestion and breakdown in the mouth Mechanical/chemical breakdown Saliva can be triggered by anything in the mouth Emotions can trigger saliva release No food absorption occurs in the mouth, pharynx, or esophagus Swallowing consists of both the buccal and pharyngeal-esophageal phase Once food enters the esophagus, it is transported to the stomach via peristalsis Swallowing and peristalsis Food breakdown in the stomach...
View Full Document

Page1 / 17

RUSSEL-lecture14-digestion_metabolism - Anatomy of the...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online