Exam 29: A: Physiology of the Digestive System

Lipase can be called a hydrolase.

The hormones GIP,secretin,and CCK are formed in the intestinal mucosa.

Chylomicrons are usually not found in the lumen of the small intestine.

Most enzymes are able to work on more than one substance.

Vasoactive intestinal peptide inhibits the production of intestinal juice.

A small amount of ingested alcohol is absorbed by the stomach.

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

The process of emulsification is important because it facilitates a greater contact area for the digestion of fat.

Mechanical digestion reduces the size of ingested food,which increases the surface area of the food making chemical digestion more efficient.

The action of bile on fat would be an example of mechanical digestion.

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

The enzymes amylase and lipase are found in saliva and are equally effective in their digestion of substrates.

The digestion of triglycerides produces monoglycerides and phospholipids.

The main glucose-digesting enzyme is glucase.

Peptidase is a digestive enzyme that can function as an intracellular enzyme.

During deglutition,food is denied entry to the larynx by muscle action that causes the epiglottis to block that opening.

Enzymes can be named based on the substance on which they act.

Chylomicrons contains almost all monoglycerides.

Chemical digestion can be defined as all of the changes in chemical composition that food undergoes as it travels through the digestive tract.

Zymogenic cells secrete enzymes into the lumen of the small intestines.