39. Digestive System

How is the stomach lining protected from the strongly acidic pH of its contents?

Which of the following might make the most effective anti-ulcer medication?

Which of the following statements regarding protein digestion is true?

Acid chyme __________.

In humans, most nutrient molecules are absorbed by the __________.

The liver and pancreas add their secretions to the partially digested food produced in the stomach, in the __________ of the small intestine.

The natural antacid that protects the intestines against stomach acid is produced by the __________.

Which of the following processes, structures, or conditions are properly matched?

Most digestive enzymes function in the __________.

Pepsin is an enzyme produced in the stomach that attacks proteins to break them down into smaller peptide molecules. Which of the following statements about this enzyme is true?

The lungs consist of many small air sacs and blood vessels, which greatly increase surface area and improve the transfer of substances through their walls. The structures in the digestive system most similar in function to these air sacs and capillaries are the __________.

Gallstone surgery sometimes requires that the gallbladder be removed. Patients are then advised to avoid ingesting large amounts of fat because __________.

Which of the following animals rely on symbiotic relationships with bacteria to obtain nutrients?

How would you expect the digestive system of a hawk to compare with that of a seed-eating sparrow?

Where does absorption take place in the small intestine?