Digestive System Flashcards Preview

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Flashcards in Digestive System Deck (17)
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1
Q

functions of digestive system

A
  • ingestion
  • secretion
  • propulsion
  • digestion
  • absorption
  • defecation
2
Q

definition of digestion

A

the mechanical and chemical breakdown of large ingested food particles into smaller molecules that may be easily absorbed by body cells

3
Q

alimentary canal

A

continuous tube extending from mouth to anus

4
Q

gross anatomic pathway

A

includes hollow organs in direct contact with food

5
Q

accessory organs of digestive system

A

salivary glands, liver, gallbladder, pancreas

6
Q

layers of alimentary canal wall

A
  • deep to superficial*
  • mucosa
  • submucosa
  • muscularis
  • serosa/adventitia
7
Q

purpose of submucosa

A
  • binds mucosa to muscularis

- reabsorbs food molecules from the mucosa

8
Q

serosa/adventita

A
  • outermost connective tissue layer

- decrease friction associated with gut motility

9
Q

segmentations

A
  • mixing contractions
  • mix chyme digestive fluids
  • food particles with mucosa brush border enzymes
10
Q

propelling movements

A

-peristaltic movements

modified peristaltic movements

11
Q

ENS (enteric nervous system)

A
  • brain of the gut
  • can function independently
  • subject to regulation by ANS
12
Q

parasympathetic innervation

A

increase in GI secretion/motility

13
Q

sympathetic innervation

A

decrease in GI secretion/motility

14
Q

peritoneum

A
  • parietal (lines wall)

- visceral (lines organs) acts as serosa

15
Q

purpose peritoneal cavity

A

allows friction free movement of viscera

16
Q

peritoneal folds: Greater Omentum

A
  • drapes over transverse colon/coils of small intestine like fatty apron
  • contains adipose tissue and any lymph nodes which help combat & contain GI infection
17
Q

peritoneal folds: Mesentery

A

bindd jejunum and ileum