Lab 7 - Digestive System

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1

Digestive System

provides the body with nutrients, water and electrolytes for health

2

Chemical digestion

hydrolysis

3

Digestion

physically - chewing or churning
chemically- hydrolysis

4

Absorption

ET cells lining tract distribute nutrients into blood

5

Alimentary Canal

GI tract gastrointestinal tract
9m long

6

Accessory digestive

teeth, salivary glands, gallbladder, liver, and pancreas

7

Alimentary Canal

mouth, pharynx, esophagus, stomach, small and large intestine

8

Mucosa membrane

wet ET membrane abutting alimentary canal lumen

9

Epithelium

layer in mucosa; simple columnar

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Lamina Propia

mucosa layer; areolar CT

11

Muscularis Mucosae

layer of smooth muscle fibers that enable local movement of mucosa

12

Mucosa functions

secretion, absorption, protection

13

Submucosa

moderately dense CT containing blood and lymphatic vessel, lymphoid follicles, and nerve fiber

14

Submucosa plexus

intrinsic nerve supply for nutrition and protection

15

Muscularis Externa

bilayer of smooth muscle with inner layer running circularly and outer layer running longitudinally

16

Myenteric plexus

nerve supply control major regulator of GI motility

17

Serosa

outermost covering of alimentary canal

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Visceral Peritoneum

another name for serosa

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Adventitia

layer of coarse fibrous CT that binds organ to surrounding tissue

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Esophagus

gullet

21

Gastroesophageal Sphincter

slight thickening of smooth muscle layer
controls food passage into stomach

22

Incisors

front 2 teeth

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Canines

eye teeth

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Premolars

bicuspids

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Teniae Coli

muscle band of large intestine

26

deciduous teeth

6m-2 1/2 years

27

permanent teeth

starts shed around age of 6 for..

28

accessory organ

teeth

29

accessory organ

salivary glands

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accessory organ

liver

31

accessory organ

gallbladder

32

accessory organ

pancreas

33

GI tract organ

esophagus

34

deciduous teeth

20 teeth total

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permanent teeth

32 teeth total

36

Parotid gland

gland located anterior to ear and ducting into mouth

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Submandibular gland

gland located in floor of mouth at base of lingual frenulum

38

Sublingual gland

gland on floor of mouth and emptying under tongue into several small ducts

39

Acinar cells

pancreas cells

40

hepatocyte

liver cells

41

lobule

liver region around central vein

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goblet cells

large intestine cell

43

1. Chief Cells
2. Parietal Cells
3. Gastric Glands
4. Gastric Pit
5.Simple Columnar ET

stomach cell (5)

44

simple columnar ET

tissue type of stomach

45

Peyer's Patches

Ileum cell

46

Brunner Glands (duodenal gland)

Duodenal

47

Villi

fingerlike projection of mucosa tunic that give appearance and texture

48

Microvilli

tiny projection on surface membrane of columnar ET lining cells of mucosa

49

1. Mucosa
2. Submucosa
3. Mucularis Externa
4. Serosa

order of cell layers (4)

50

Duodenum
Ileum
Jejunum

Three regions of small intestine

51

Epithelium
Lamina propria
Muscularis Mucosae

three layer located in mucosa region

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Rugae

muscle of the stomach

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cardiac region

region where food enters stomach

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Stratisfied squamous ET

ET type of esophagus

55

Ileocecal valve

small intestine connects to large intestine

56

Ascending colon

right upper side of ab cavity

57

Descending colon

left side of ab cavity

58

Sigmoid colon

end region of descending cavity

59

Haustrum

small pocket-like sacs in large intestine

60

External Anus Sphincter

muscular band that wraps around anus canal

61

Sphincter

a ring of muscle that contracts to close an opening

62

Cecum

located next to iIleocecal valve before ascending colon

63

Common Hepatic Duct

duct that leaves liver and enters duodenum

64

Bile and Cystic duct

duct of gallbladder

65

Cystic duct

when digestion is not occuring bile backs up into gallblader

66

Falciform Ligament

a ligament that attaches part of the liver to the diaphragm and the abdominal wall

67

Bile duct

duct that enters into the duodeum, breaks up large fat particles into smaller ones

68

1. Liver
2. Common Hepatic Duct
3. Bile duct
4. Duodenum
5. Cystic duct - no digestion occurs
6. Gallbladder

pathway of bile (6)

69

pepsinogen

chief cells in stomach secrete

70

HCI

parietal cells in stomach secrete