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 Module 2218 Accessory Digestive Organs Accessory digestive organs ID: 781033
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Slide1
Digestive System:
Outcome: I can describe the structure and functions of the accessory organs of the digestive systemDrill: What are the three regions of the small intestine?
Slide2Module 22.18: Accessory Digestive Organs
Accessory digestive organsSalivary glands Produce saliva containing mucins and enzymesGallbladder Stores and concentrates bile secreted by the liverPancreas Exocrine cells secrete buffers and digestive enzymesEndocrine cells secrete several hormonesLiver Almost 200 known functions
© 2015 Pearson Education, Inc.
Slide3© 2015 Pearson Education, Inc.
Accessory digestive organs
Figure 22.18
Accessory
Digestive
Organs
Salivary Glands
Gallbladder
Pancreas
Liver
Slide4Module 22.19: Salivary Glands
Salivary glandsThree pairs of glandsSecrete saliva into the oral cavity through ducts© 2015 Pearson Education, Inc.
Slide5Module 22.19: Salivary Glands
Three pairs of salivary glands Sublingual salivary glands Lie under either side of the tongueProduce a mucous secretion that acts as a buffer and lubricantProvide ~5 percent of total saliva secretion© 2015 Pearson Education, Inc.
Slide6Module 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 amylaseAmylase is an enzyme that breaks down starches
Provide ~70 percent of total saliva secretion
© 2015 Pearson Education, Inc.
Slide7Module 22.19: Salivary Glands
Three pairs of salivary glands (continued) Parotid salivary glandsLie inferior to the zygomatic arch, deep to the skin, covering the mandibleProvide ~25 percent of total saliva secretion© 2015 Pearson Education, Inc.
Slide8© 2015 Pearson Education, Inc.
The salivary glands
Figure 22.19
1
Parotid duct
Sublingual
ducts
Submandibular
duct
The
Salivary
Glands
Sublingual
salivary
glands
Submandibular
salivary
glands
Parotid
salivary
glands
Slide9Module 22.20: The Liver
LiverLargest visceral organWeighs 1.5 kg (3.3 lb)Composed of four lobesRight, left, caudate, quadrate© 2015 Pearson Education, Inc.
Slide10Module 22.20: The Liver
Lobes of the liver Left lobe Right lobe Caudate lobeOn the posterior surface of the liverSeparated from right lobe by an indentation Quadrate
lobe
Located
between the left lobe and the gallbladder
© 2015 Pearson Education, Inc.
Slide11Module 22.20: The Liver
Associated structuresGallbladder Temporarily stores bile produced by the liverCommon bile duct Carries bile from the liver and gallbladder to the duodenumPorta hepatis (“doorway to the liver”)Region containing: Blood vessels and other structures entering the liver Common bile duct© 2015 Pearson Education, Inc.
Slide12© 2015 Pearson Education, Inc.
Overview of the liver
Figure 22.20
2
Right lobe
Left lobe
Falciform
ligament
Gallbladder
Round ligament
Anterior
surface
Coronary
ligament
Coronary
ligament
Bare area
Left lobe
Right lobe
Lobes of the Liver
Caudate lobe
Quadrate lobe
Gallbladder
Posterior
surface
Porta
Hepatis
Common bile duct
Slide13Module 22.22: The Gallbladder and Pancreas
GallbladderHollow, pear-shaped organ Located in the depression on the posterior surface of the liver’s right lobeStores and concentrates bile secreted from the liverBile salts break lipid droplets apartProcess called emulsification© 2015 Pearson Education, Inc.
Slide14© 2015 Pearson Education, Inc.
Overview of the gallbladder
Figure 22.22
1
Right
and
left
hepatic
ducts
Common
hepatic
duct
Common
bile
duct
Liver
Duodenum
Stomach
Pancreas
Cystic duct
Pancreas
–
2
Gallbladder
Slide15© 2015 Pearson Education, Inc.
Liver
Gall
bladder
Duodenum (Small Intestine)
1
3
2
5
4
Slide16© 2015 Pearson Education, Inc.
Right Hepatic DuctLeft Hepatic DuctCommon Hepatic DuctCystic DuctCommon Bile Duct
Slide17Module 22.22: The Gallbladder and Pancreas
PancreasLies posterior to stomach (retroperitoneal)Extends laterally from the duodenum toward the spleenSlender, pinkish-gray organHas three parts: head, body, tail© 2015 Pearson Education, Inc.
Slide18Module 22.22: The Gallbladder and Pancreas
Pancreas (continued)Pancreatic ductDelivers exocrine secretions to the duodenumPancreatic juiceCombination 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© 2015 Pearson Education, Inc.
Slide19© 2015 Pearson Education, Inc.
Overview of the pancreas
Figure 22.22
4
Tail of
pancreas
Body of
pancreas
Head of
pancreas
Duodenum
Common bile duct
Accessory
pancreatic
duct
Pancreatic
duct
Pancreatic
lobules
–
5
Slide20Due by Wednesday January 25th:
1) Digestive System on Clay Maniken2) Completed Lab 3.2.2 and Conclusion Questions3) Powerpoint addressing all questions on assigned Digestive System organ(s)/structure(s)4) 3D Model of assigned Digestive System organ(s)/structure(s)© 2015 Pearson Education, Inc.
Slide21Quarterly 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.© 2015 Pearson Education, Inc.
Slide22Digestive System:
Exit Ticket: Which salivary gland provides a majority of the saliva in the oral cavity?