Lecture 11: GI Secretory Functions, Digestion, & Absorption Flashcards Preview

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Flashcards in Lecture 11: GI Secretory Functions, Digestion, & Absorption Deck (25):
0

Where does the first stage of salivary secretion of ions occur?

Acini

1

The second stage of salivary secretion of ions occurs in the _____.

Salivary ducts

2

What is the final ionic concentration of saliva?

Na+ & Cl-: 15 mEq/L
K+: 30 mEq/L
Bicarbonate: 50-70 mEq/L

3

During maximal secretion of ions in saliva, the increase can be _____.

20-fold

4

Chief cells secrete _____ in response to Ach from _____ nerve or gastric enteric nervous plexus

Pepsinogen
Vagus

5

What do parietal cells secrete?

HCl

6

What sort of nervous stimulation causes gastric secretions?

Parasympathetic

7

What is gastrin released in response to the presence of?

Protein in the plylorus

8

Gastrin causes enterochromaffin-like cells to release _____ which causes the secretion of _____.

Histamine
HCl

9

What causes cephalic phase stimulation?

Vagus nerve

10

What causes gastric phase secretion?

Local nervous secretory reflexes
Vagal reflexes
Gastrin-histamine stimulation

11

What causes intestinal phase secretion?

Nervous & hormonal mechanisms

12

What are the digestive enzymes for proteins?

Trypsin, chymotrypsin, & carboxypolypeptidase

13

How is trypsin kept from destroying pancreatic tissues?

Glandular cells secrete a trypsin inhibitor

14

What is the digestive enzyme for carbs?

Amylase

15

What are the digestive enzymes for fat?

Pancreatic lipase, cholesterol esterase, & phospholipase

16

What is released via stimulation of food in the upper intestine and increases secretion of pancreatic enzymes?

CCK

17

What is released via stimulation by presence of acidic foods in upper intestine and releases large amounts of sodium bicarbonate?

Secretin

18

Which of the following cause CCK release?
Fats
Amino acids
Carbs

Fats and amino acids

19

What stimulates the release of bile from the gall bladder?

Presence of fatty food

20

What are causes of gallstones?

Too much absorption of water, bile, or cholesterol or inflammation of epithelium

21

Glucose absorption in the small intestine utilizes a _____ mechanism.

Na+ active co-transport

22

Absorption of peptides/amino acids in the small intestine utilizes a _____ mechanism.

Na+ active co-transport mechanism

23

Absorption of fats in the small intestine utilizes a _____ mechanism.

Micelles & chylomicrons

24

What gets absorbed in the large intestine?

Na+ & Cl-
Water
Bicarbonate