Exam 40: Digestion and Absorption

One of the functions of cholecystokinin is to enhance the influence of gastrin on gastric parietal cells.

Enzymes are unique in that they can function optimally within a wide range of pH.

Chief cells produce pepsin.

Most enzymes are able to catalyze reactions in both directions, but that rarely occurs in digestive enzymes.

Because enzymes are not changed by the chemical reactions they catalyze, digestive enzymes rarely need to be made.

The only voluntary activity of the GI tract is swallowing.

The involuntary part of swallowing is regulated by the deglutition center of the medulla.

Match each of the digestive juices and enzymes with its corresponding description. -Enzyme that works on starch

Vitamins A, D, E, and K depend on bile salts for their absorption.

The hormone that inhibits gastric muscle, slowing passage of food into the duodenum, is called:

Contact digestion makes absorption more efficient because the end products are then physically near the point of absorption, not floating around somewhere in the lumen.

Digestion uses the following methods in which order to accomplish its function?

Sucrase hydrolyzes sucrose into glucose and fructose.

The prefix "amyl" comes from the Latin word for "starch." How does that explain the name for an enzyme in carbohydrate digestion?

Most enzymes catalyze a chemical reaction in both directions. Which is the best explanation of this statement?

Paracellular absorption is the absorption of nutrients between cells.

During deglutition, the mouth is closed off by the soft palate and the uvula.

After the absorption of a large meal, high levels of glucose and amino acids would be found in the:

Match each primary mechanism of the digestive system with its corresponding definition. -Release of digestive juices; release of endocrine hormones that regulate digestion or metabolism of nutrients

The only food that can be digested by gastric juice is protein.