23. The Digestive System

Trace the path of a single protein molecule that has been ingested. The protein molecule must be digested before it can be transported to and utilized by the cells becausea. protein is only useful directly,b. protein has a low pH,c. proteins in the circulating blood produce an adverse osmotic pressure,d. the protein is too large to be readily absorbed.

Which of the following cells produce HCl?

An anorexic girl shows a high level of acetone in her blood. What is this condition called, and what has caused it?

Which of the following is NOT a function of the stomach?

What are the main organic molecules digested in the stomach?

Some aspects of the __________ phase of gastric secretion, which occur before food enters the stomach, may be considered conditioned reflexes.

Describe the role of these cells found in gastric glands: parietal, chief, mucous neck, and enteroendocrine.

Recently, more people have turned to surgery to help them lose weight. One form of weight control surgery involves stapling a portion of the stomach shut, creating a smaller volume. How would such a surgery result in weight loss?