Exam 40: Digestion and Absorption

What is found in the secretions of the salivary glands? Why is the lipase found in saliva ineffective as a digestive enzyme in the mouth?

Chylomicrons are absorbed by the blood vessels in the villi of the small intestine.

Which of the following structures is not used to block an opening during swallowing?

Segmentation is described as a wavelike muscle contraction in a hollow organ that moves food through the digestive system.

Which of the following does not cause a decrease in gastric peristalsis?

The hormone that stimulates the release of bicarbonate substance from the pancreas is:

The enzyme pepsin begins the digestion of:

Saliva contains all of the following substances except:

Explain ways in which gastric motility is regulated.

The stimulation of gastric juice secretions occurs in five phases controlled by reflex and chemical mechanisms.

Lecithin is secreted by the liver.

Mechanical digestion pushes food against the wall of the small intestine so it can be absorbed.

The specificity of enzyme function can be explained by the "key-in-a-lock" mode of action.

Colipase is a substance made by the small intestine, and it functions as a coenzyme in fat digestion.

Enterokinase is converted to trypsinogen by trypsin.

The hydrophilic portion of lecithin is attracted to the exterior water of the micelle.

The pancreatic duct, which connects the pancreas to the small intestines, does not carry the enzyme trypsin.

Jeff was a successful country music star, but he worked too hard and was under great stress. His physician cautioned him that if he did not alter his lifestyle, he would be subject to hyperacidity. What could be the resulting condition of hyperacidity? Explain how the hyperacidity develops.

Respiration is inhibited for the 1 to 3 seconds required for food to clear the pharynx during each swallowing.

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