The Digestive System: Secretion

The intestinal hormone _____ causes contraction of the gall bladder and release of bile into the duodenum.

cck

Which of the following is a function of HCl in the stomach? a. Activates pepsinogen b. Breaks down cell walls c. Kills most bacteria d. Denatures proteins in food e. All of the above are functions of HCl

e. All of the above are functions of HCl

Intestinal ________ converts (activates) trypsinogen into trypsin.

enterokinase

The esophagus secretes digestive enzymes.

false

The four main components of gastric juice are:

mucus pepsinogen HCL Intrinsic factor

_______ _______protects the wall of the large intestine from mechanical damage and from damage by bacterial acid.

alkaline mucus

. List the only two substances that are absorbed across the stomach's mucosal epithelium

aspirin alcohol

. List the three major proteases (inactive forms) secreted by the exocrine pancreas

trysinogen, chymotrypsinogen, and procarboxypeptidase

1. Of the approximately 9.0 L of fluids contained in the digestive tract daily, only __________ L are eliminated with the feces.

.15 l

HCl in the stomach produces a pH of between ________ in the luminal fluid.

1.5-2.0

. Of the approximately 800 g of food ingested during a typical day, only about ____ g are eliminated as undigested food in the feces.

50g

parietal cell chief cell paracrine cell mucus neck cells

HCl + IF pepsinogen histamine

Without _______ _______, vitamin B12, necessary for normal RBC development, can not be absorbed by the intestine.

Intrinsic factor

Intestinal digestive enzymes that are embedded in the epithelial microvilli membranes are called ________ ________ enzymes.

bush border

The pancreatic hormone _______ regulates the absorptive state, while ______ regulates the postabsorptive state.

a. insulin b. glucagon

List the four organic components of bile:

bile salts, lecithin, cholesterol, and bilirubin

List the four major functions of saliva.

protection taste lubrication digestion

Gastrin is released from the ______ region of the stomach.

pyloric

Gastrin producing G-cells are found in the gastric glands located in the ________ region of the stomach.

pyloric region