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Flashcards in Activities of the Alimentary Canal Deck (16):
1

What are the 4 activities of the alimentary canal?

Motility
Secretion
Digestion
Absorption

2

What is the mechanical activity mostly involving smooth muscle?

motility

3

What occurs in the lumen of the digestive tract in response to the presence of food, hormonal and neural signals?

secretion

4

What is secretion required for?

digestion, protection and lubrication

5

What is the chemical breakdown of complex foodstuffs to smaller, absorbable units?

digestion

6

How are complex foodstuffs broken down in digestion?

enzymatic hydrolysis

7

Where does physical digestion occur?

mouth, small intestine and stomach

8

What is the transfer of the absorbable products of digestion from the digestive tract to the blood or lymph?

absorption

9

What are the main general layers of the digestive tract wall?

mucosa
submucosa
muscularis externa
serosa

10

Which cells would you find in the mucosa of the digestive tract wall?

epithelial cells
exocrine cells
endocrine gland cells
lamina propria
muscularis mucosae

11

What makes up the submucosa of the digestive tract?

CT
larger blood and lymph vessels
glands
nerve network (sub mucous plexus)

12

What makes up the muscular externa?

circular muscle layer
nerve network (myenteric plexus)
longitudinal muscle layer

13

What is the serosa composed of?

connective tissue

14

What happens when circular muscle contracts?

narrower and longer lumen

15

what happens when longitudinal muscle contracts?

shorter and fatter intestine

16

What happens when the muscularis mucosae contracts?

change in absorptive and secretory area of mucosa (folding), mixing activity