Lab 5: Gastrointestinal tract

Q2: What are the folds in the epithelium called? 

A. Lamina propria 

B. Villi & crypts

C. Muscularis mucosae 

B

Q3: Which cells are interspersed in the GI epithelium? 

A. Goblet cells

B. Paneth cells 

C. Schwann cells 

a

Q4: The simple epithelium found in serosa is called: 

A. Endothelium 

B. Epithelium propria 

C. Mesothelium

c

Q5: Which connective tissue layer supports the epithelium in mucosa? 

A. Lamina propria

B. Submucosa 

C. Adventitia 

a

Q6: Submucosa contains: 

A. Goblet cells 

B. Arteries, veins, lymphatics, nerves, sometimes glands

C. Only muscles 

b

Q7: Adventitia is: 

A. Smooth muscle layer 

B. Loose irregular connective tissue with blood vessels, nerves, fat

C. Same as submucosa 

b

Q8: Serosa consists of: 

A. Lamina propria 

B. Mesothelium + thin loose connective tissue

C. Stratified squamous epithelium

b

Q9: Muscularis mucosae is: 

A. Smooth muscle in mucosa

B. Skeletal muscle in rectum 

C. Circular and longitudinal muscle only

a

0: Muscularis externa is: 

A. Only skeletal 

B. Mostly smooth (circular & longitudinal), skeletal in superior third of oesophagus

C. Only smooth 

b

Q11: Sphincters contain: 

A. Only skeletal 

B. Both smooth and skeletal muscle

C. Only smooth 

b

Q12: The Enteric Nervous System has which two plexuses? 

A. Myenteric & submucosal

B. Sympathetic & parasympathetic 

C. Lamina & adventitia

a

Q13: The ENS controls: 

A. Blood pressure only 

B. Oxygen transport 

C. Motor activity of muscles & gland secretion

c

Q1: The mucosa and submucosa of the oesophagus are packed into large folds to: 

A. Increase surface area for absorption 

B. Allow expansion during the passage of a large bolus

C. Store mucus 

D. Strengthen the oesophageal wall 

b

Q2: The mucosa of the oesophagus is composed of: 

A. Keratinized stratified squamous epithelium 

B. Nonkeratinized stratified squamous epithelium

C. Simple columnar epithelium 

D. Pseudostratified ciliated epithelium 

b

Q3: The muscularis mucosae of the oesophagus consists of: 

A. Skeletal muscle 

B. Smooth muscle arranged irregularly

C. Longitudinal skeletal fibers 

D. Cardiac muscle 

b

Q4: The oesophageal glands are located in which layer? 

A. Mucosa 

B. Muscularis externa 

C. Submucosa

D. Adventitia 

c

5: What is the function of oesophageal glands? 

A. Secrete enzymes for digestion 

B. Produce mucus to reduce friction

C. Absorb nutrients 

D. Produce hormones 

b

Q6: The muscularis externa of the oesophagus is composed of: 

A. Only smooth muscle 

B. Only skeletal muscle 

C. Inner circular and outer longitudinal layers

D. Crossed oblique muscle fibers 

c

7: The superior third of the oesophageal muscularis externa contains: 

A. Smooth muscle only 

B. Skeletal muscle

C. A mix of smooth and skeletal muscle 

D. Cardiac muscle 

b

Q8: The middle third of the oesophagus contains: 

A. Smooth muscle only 

B. Skeletal muscle only 

C. A mixture of skeletal and smooth muscle

D. Oblique smooth muscle 

c

Q10: The adventitia of the oesophagus is composed of: 

A. Dense regular connective tissue 

B. Loose connective tissue outside the muscular layer

C. Smooth muscle 

D. Serous membrane 

b

Q11: The main function of the oesophageal adventitia is to: 

A. Produce mucus 

B. Anchor the oesophagus to the posterior body wall

C. Absorb nutrients 

D. Support peristalsis 

b