1. Digestive System:
Outcome: I can describe the structure and functions of the accessory organs of the digestive system
Drill:
What are the three regions of the small intestine?

2. Module 22.18: Accessory Digestive Organs
Salivary glands
Produce saliva containing mucins and enzymes
Gallbladder
Stores and concentrates bile secreted by the liver
Pancreas
Exocrine cells secrete buffers and digestive enzymes
Endocrine cells secrete several hormones
Liver
Almost 200 known functions
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3. Accessory Digestive Organs Salivary Glands Gallbladder Pancreas Liver
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Figure 22.18

4. Module 22.19: Salivary Glands
Three pairs of glands
Secrete saliva into the oral cavity through ducts
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5. Module 22.19: Salivary Glands
Three pairs of salivary glands
Sublingual salivary glands
Lie under either side of the tongue
Produce a mucous secretion that acts as a buffer and lubricant
Provide ~5 percent of total saliva secretion
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6. Module 22.19: Salivary Glands
Three pairs of salivary glands (continued)
Submandibular salivary glands
Along the inner surface of the mandible (in the mandibular groove)
Secrete a mixture of buffers, mucins, salivary amylase
Amylase is an enzyme that breaks down starches
Provide ~70 percent of total saliva secretion
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7. Module 22.19: Salivary Glands
Three pairs of salivary glands (continued)
Parotid salivary glands
Lie inferior to the zygomatic arch, deep to the skin, covering the mandible
Provide ~25 percent of total saliva secretion
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8. Parotid duct Sublingual ducts Submandibular duct The Salivary Glands
Parotid salivary
glands
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Figure 22.19 1

9. Module 22.20: The Liver Liver Largest visceral organ
Weighs 1.5 kg (3.3 lb)
Composed of four lobes
Right, left, caudate, quadrate
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10. Module 22.20: The Liver Lobes of the liver Left lobe Right lobe
Caudate lobe
On the posterior surface of the liver
Separated from right lobe by an indentation
Quadrate lobe
Located between the left lobe and the gallbladder
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11. Module 22.20: The Liver Associated structures Gallbladder
Temporarily stores bile produced by the liver
Common bile duct
Carries bile from the liver and gallbladder to the duodenum
Porta hepatis (“doorway to the liver”)
Region containing:
Blood vessels and other structures entering the liver Common bile duct
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12. Coronary ligament Right lobe Left lobe Falciform ligament Gallbladder
Overview of the liver
Coronary
ligament
Right lobe
Left lobe
Falciform
ligament
Gallbladder
Round ligament
Anterior
surface
Coronary
ligament
Bare area
Lobes of the Liver
Left lobe
Caudate lobe
Right lobe
Porta Hepatis
Quadrate lobe
Gallbladder
Common bile duct
Posterior
surface
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Figure 22.20 2

13. Module 22.22: The Gallbladder and Pancreas
Hollow, pear-shaped organ
Located in the depression on the posterior surface of the liver’s right lobe
Stores and concentrates bile secreted from the liver
Bile salts break lipid droplets apart
Process called emulsification
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14. Figure 22.22 1 – 2 Right and left hepatic ducts Common hepatic duct
Overview of the gallbladder
Right and left
hepatic ducts
Common
hepatic
duct
Gallbladder
Cystic duct
Liver
Duodenum
Common
bile duct
Pancreas
Stomach
Pancreas
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Figure 22.22 1 – 2

15. Liver 1 2 3 4 5 Duodenum (Small Intestine) Gall bladder
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16. Right Hepatic Duct Left Hepatic Duct Common Hepatic Duct Cystic Duct
Common Bile Duct
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17. Module 22.22: The Gallbladder and Pancreas
Lies posterior to stomach (retroperitoneal)
Extends laterally from the duodenum toward the spleen
Slender, pinkish-gray organ
Has three parts: head, body, tail
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18. Module 22.22: The Gallbladder and Pancreas
Pancreas (continued)
Pancreatic duct
Delivers exocrine secretions to the duodenum
Pancreatic juice
Combination of water and ions (secreted by epithelial cells lining the duct) and exocrine secretions (enzymes and buffers)
About 1000 mL (1 qt) of pancreatic juice produced each day
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19. Figure 22.22 4 – 5 Overview of the pancreas Pancreatic lobules
duct
Common bile duct
Body of
pancreas
Accessory
pancreatic
duct
Tail of
pancreas
Head of
pancreas
Duodenum
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Figure 22.22 4 – 5

20. Due by Wednesday January 25th: 1) Digestive System on Clay Maniken 2) Completed Lab and Conclusion Questions 3) Powerpoint addressing all questions on assigned Digestive System organ(s)/structure(s) 4) 3D Model of assigned Digestive System organ(s)/structure(s)
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21. Quarterly will consist of 40 multiple-choice questions and one essay
Quarterly will consist of 40 multiple-choice questions and one essay. Essay Topic: Detailed response on food passing through digestive tract and explaining ALL organs/structures involved in great detail. Also explaining in what parts of the digestive system are carbs, lipids, and protein broken down.
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22. Digestive System:
Exit Ticket:
Which salivary gland provides a majority of the saliva in the oral cavity?