Exam 29: A: Physiology of the Digestive System

Oral rehydration therapy can be used to replace fluids lost by way of diarrhea.

Bile catalyzes the breakdown of fats.

In the pancreas,base is secreted into the GI lumen and acid is secreted into the blood.This is the reverse of what happens in the stomach.

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

After leaving the stomach,chyme normally takes about 5 hours to pass all the way through the small intestine.

Secretions of the digestive glands are mostly water.

Sucrase hydrolyzes sucrose into glucose and fructose.

Most enzymes in the body are intracellular.

Gastric inhibitory peptide and the enterogastric reflex have opposite effects on gastric peristalsis.

Some of the enzymes in pancreatic juice are inactive.

The drug omeprazole (Prilosec)works by stimulating the H-K pumps,thereby reducing the amount of acid in the stomach.

Because acid would be harmful to enzymes,the salivary glands produce bicarbonate ions to lower the pH of saliva.

The only voluntary activity of the GI tract is swallowing.

The blood surrounding the pancreas would have a slightly higher pH than blood in other parts of the body.

Of the four types of protein-digesting enzymes made by the body,only one is made by the small intestines.

Elimination of gray-colored feces is an indication of abnormal bile secretion.

Bile is involved in both secretion and excretion.

Mastication is another word for chewing.

Drinking large amounts of water works best as a means of replacing fluids quickly during exercise.

Micelles are formed in the GI lumen.