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Do Now

Do Now. Please copy the following words into your notes Secretin - a hormone that stimulates basic pancreatic juices Gastrin -a hormone that increases the production of digestive juices Cholecystokin - a hormone that stimulates digestive pancreatic juices and bile release

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Do Now

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  1. Do Now • Please copy the following words into your notes • Secretin- a hormone that stimulates basic pancreatic juices • Gastrin-a hormone that increases the production of digestive juices • Cholecystokin- a hormone that stimulates digestive pancreatic juices and bile release • Pepsin-an enzyme that digests proteins • Amylase-an enzyme that digests carbohydrates • Lipase- an enzyme that digests lipids

  2. Digestive System

  3. Outline • Week One • Diagrams & layers of digestive system • Tongue, palate, teeth & salivary glands • Pharynx, esophagus, stomach • Pancreas, liver, gallbladder & intestines • Week Two • Diseases and treatments • Review • TEST (MARCH 1st!)

  4. Pharynx • Connects nasal & oral cavities to trachea and esophagus

  5. Pharynx • Covered by the epiglottis • OBSERVE the shape of the epiglottis. What do you think that it does? Food Air

  6. Pharynx • Where swallowing happens • Soft palate BLOCKS nasal cavity • Tongue pushes food back and blocks oral cavity • Epiglottis blocks trachea (breathing) • Food forced into the esophagus

  7. Esophagus • Moves food to stomach using smooth muscles

  8. Stomach • Main location of chemical digestion • Some mechanical when stomach churns • Three main cells • Chief cells: Make pepsinogen • Parietal cells: Make hydrochloric acid • Mucus cells: Make mucus

  9. Pepsinogen…? • Inactive (doesn’t digest things) until it meets acid • Turns into PEPSIN • Pepsin digests proteins (peptides)

  10. Ever smell something and get hungry? • Gastrin is triggered when we see, taste or smell food • Gastrin stimulates stomach juices • So… you feel hungry when you think of or see food!

  11. Diagram • Create a diagram of the words from the digestive system studied so far and their functions! • If you finish early, you may begin the weekly review sheet • Layers of the digestive system • Mucosa • Submucosa • Muscular • Serosa • Pharynx • Stomach • Esophagus • Tongue • Uvula • Teeth • Soft & hard palate

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