Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Digestion and Excretion > Small Intestine secretions and GI motility > Flashcards

Small Intestine secretions and GI motility Flashcards

1
Q

What are the 3 surface area adaptations for the small intestine?

A

Plicae circularis -> villi -> microvilli

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Where are the microvilli found?

A

On top of intestinal enterocytes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What are the different cell types and their roles?

A

Enterocytes - absorptive
Goblet cells - secretory
Paneth cells - defense
Enteroendocrine cells - hormone secretion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What are the glands at the bottom of the villi called?

A

Crypts of Lieberkuhn

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What secretes mucous in the small intestine?

A

Brunner’s glands and goblet cells

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

How much does the small intestine approx. absorb?

A

8500mls

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What hormones do the enteroendocrine cells produce?

A

CCK, secretin and motilin

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the greatest volume of small intestine secretion?

A

Cl- rich isotonic fluid by crypts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is the specialization found in the duodenum?

A

presence of Brunner’s glands in submucosa
Secretes bicarbonate rich secretions - change pH

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is the specialization found in the jejunum?

A

Plicae circularis - most abundant here

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the specialization found in the ileum?

A

Peyer’s patches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the main blood supply for the small intestine?

A

Superior mesenteric artery

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What facilitates absorption?

A

Extensive mucosal vascularization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What are the three types of small intestinal musculature?

A

Basal tone, mixing contractions and moving contractions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What are segmentation contractions?

A

Static contractions on either side of the tube
Rhythmic irregular contractions
Divide up luminal content - mixing the chyme
Most common after feeding

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is segmentation modified by?

A

ENS, parasympathetic and sympathetic innervation

17
Q

What is peristalsis in the small intestine?

A

Adjacent contractions in aboral movement
Occurs in response to luminal distension
Longitudinal and circular muscle

18
Q

What is peristalsis modified by?

A

Enteric nervous system, ACh, VIP or NO

19
Q

What is the myoelectrical complex?

A

Slow migration of undigested food
stimulated by motilin
3 phases

20
Q

What are the 3 phases of the migrating motor complex?

A

Quiescence - no contractions
Phase II - irregular contractions
Phase III - regular contractions

21
Q

What is the autonomic control of the small intestine?

A

Parasympathetic nerve activity
Vagus nerve

22
Q

What is the hormonal control of the small intestine?

A

Motilin
Gastrin (gastro-ileal reflex)

23
Q

What is the enteric control of the small intestine?

A

Basal electrical rhythm (ICC)

24
Q

How does the contribution of the vagus nerve to the GIT motility differ as we move down the tract?

Digestion and Excretion (22 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions