Small intestinal secretion

Question 1

Brunner’s gland secretes what?

Answer 1

Alkaline mucus

Question 2

Where is Brunner’s gland located?

Answer 2

after pylorus up to 2nd part of the duodenum

Question 3

When is alkaline mucus secreted?

Answer 3

irritating stimuli
vagal stimulation
secretin

Question 4

alkaline mucus will be added with bicarbonate from pancreatic juices to _____________.

Answer 4

neutralize acidic gastric juices

Question 5

Small pits between intestinal villi

Answer 5

Crypts of lieberkhun

Question 6

Goblet cells secrete ________.

Answer 6

mucus

Question 7

Enterocytes secrete _________.

Answer 7

large amounts of water and electrolytes

Question 8

rate of secretion by enterocytes

Answer 8

1800 mL/day

Question 9

alkaline pH of enterocyte secretion

Answer 9

pH 7.5- 8.0

Question 10

This acts as a watery vehicle for absorption from chyme

Answer 10

Enterocyte fluids

Question 11

active processes involved in the secretion of watery fluid by crypts of lieberkuhn

Answer 11

Chloride secretion
Bicarbonate secretionn

Question 12

active secretion of chloride ion and bicarbonate results to __________________.

Answer 12

dragging of sodium through the membrane and into secreted fluid

Question 13

Peptidase function

Answer 13

split peptides to amino acids

Question 14

sucrase, maltase, isomaltase, lactase function

Answer 14

split disaccharides into monosaccharides

Question 15

intestinal lipase function

Answer 15

splits neutral fats into glycerol and fatty acids

Question 16

How are new digestive enzymes form through crypts of lieberkuhn

Answer 16

crypts of lieberkuhn –> mitosis –> new cells into tip of villi –> replace epithelium & new enzymes form

Question 17

intestinal epithelial cells’ life

Answer 17

half life –> 5 days

rapid growth = rapid repair

Question 18

Most important stimuli for small intestine secretion regulation:

Answer 18

Local enteric nerve reflex from tactile
Irritative stimuli from chyme