Digestion 3: Secretion Flashcards Preview

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Flashcards in Digestion 3: Secretion Deck (111)
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1

secretion

release of materials from cells that line the lumen of the GI

2

Where do secretion products end up?

- ISF: paracine action
- blood stream
- lumen of GI

3

where can goblet cells be found?

small & large intestines

4

which cells secrete mucus in the stomach?

Foveolar cells

5

largest endocrine system in the body is...

enteroendocrine cells (EEC)
- cells that secrete hormones in the GI

6

there are ___ types of EECs, and ___ types of GI hormones

18-20;
18-20

7

EEC function is influenced by...

- GI contents
- ANS

8

describe EECs

single cells scattered throughout the length of the GI; secrete hormones

9

Goblet cells refer to...

mucus secreting cells that is shaped like a goblet (more like a comma ",")

10

we take in about __ L of fluid a day, but there is __ L of fluid entering the GI tract in total due to...

2L;
7L;
secretions from the liver, pancreas, etc.

11

how much is secreted & absorbed in toe GI tract per day?

9 L total input

12

secretions into the GI include...

- saliva
- bile
- gastric secretions
- pancreatic secretions
- intestinal secretions

13

secretions into the GI = ___x the volume of ____

2x;
plasma

14

how are fluids removed from the GI?

- absorption: small (main effect) & large intestines
- excretion: feces (small effect)

15

How is SA in the GI increased?

1) folds (3x)
2) hills & valleys (10x)
3) microscopic protrusions (20x)

16

SA increase method that can be found in the stomach

folds & valleys (no hills!)

17

rugae

folds on the inside of your stomach to allow expansion

18

valleys in the stomach =

gastric pits

19

gastric pits = opening to...

gastric gland

20

entrance to gastric glands are within the ___

rugae

21

anatomy: upper curve of the stomach

fundus

22

anatomy: antrum

nearly closed cavity located immediately before the stomach outlet. It is lined by mucosa and it does not produce acid

23

hills & valleys =

hills = villi
valleys = crypts

24

SA increase methods that can be found in the small intestines

- folds (plica or valvulae conniventes)
- hills (villi)
- valleys (crypts of Lieberkuhn)
- microscopic protrusions (microvilli)

25

differences between rugae and plica

plica is in small intestines, and is permanent

26

Crypts of Lieberkuhn extend to...

into the mucosa of the small & large intestines

27

SA increase in large intestines

1) folds (haustra)
2) valleys (crypts of Lieberkuhn) - no hills!

28

haustration

when food pushes the haustra outwards, creating bulges & increased SA

29

what causes haustra in the large intestines?

lack of resistance underlying the circular muscle in the large intestine during segmentation

30

what can haustration be classified as?

motility pattern