BYUI BIO265 Lecture Final Exam

Which of the following cell types is correctly matched with its function?

Parietal cells - produce hydrochloric acid

____ breaks down ____.

Peptidases; proteins

Which of these stomach cell types is not correctly matched with its function?

chief cells: produce intrinsic factor

The aqueous component of pancreatic secretions

contains bicarbonate ions.

Bile

contains breakdown products from hemoglobin and emulsifies fats.

Assume we could alter the conditions in the duodenum. If we inserted a large volume of highly acidic chyme which contained a large amount of fat which of the following responses are consistent with that?

decreased gastric acid secretion; increased bile production; increased pancreatic bicarbonate production and pancreatic enzymes secretion; increased secretin and cholecystokinin

Stress would cause GI motility and secretions to be

decreased.

The enterogastric reflex can be triggered by

distention of the duodenal wall.

Lecithin prepares fats for hydrolysis by forming

emulsification droplets

Functions of the digestive system include al of the following except

hormone degradation.

The villi, microvilli and plicae circularis function to

increase surface area for absorption.

In comparison to a low-density lipoprotein (LDL), a high-density lipoprotein (HDL) contains

less lipids

Damage to the liver would hamper digestion of

lipids.

The ____ synthesizes bile acids by metabolizing ____.

liver, cholesterol

Clotting factors are produced by the

liver.

Carbohydrate digestion begins in the ____, whereas protein digestion begins in the ____.

mouth, stomach

Which of the following structures has both endocrine and exocrine tissue?

pancreas

Hydrochloric acid (HCI) is secreted by ____ cells.

parietal

Which of the following events occurs because of the low pH of the stomach?

proper environment for functioning of pepsin.

Which of the following regions of the stomach is correctly matched with its description?

pylorus - the most inferior portion of the stomach

Cholesterol produced by the body is transported in the blood as

very low-density

____ is the physiological process that moves a nutriend from the lumen to the circulating blood.

Absorption

Use the key to choose the best answer. 1. amount of bicarbonate in the aqueous component of pancreatic juice 2. amount of bicarbonate in the enzymatic portion of pancreatic juice.

Choose this if the first item is greater than the second item.

Which of the following is true?

Intestinal epithelial cells absorb more dipeptides and tripeptides than single amino acids.