Exam 23: The Digestive System

Peristaltic waves are ________.

Proteins entering the stomach act as a buffer raising pH.Rising pH stimulates the activity of G-cells in the lining of the stomach.All of the following but one will occur.Select the statement below that would not occur.

Which of the following is least involved in the mechanical breakdown of food,digestion or absorption of nutrients?

Compare and contrast the structure and function of a premolar and a molar.

Pepsinogen,an inactive digestive enzyme,is secreted by the ________.

Identify three ways the small intestine is modified to increase the surface area for digestion and absorption.

In the enteric nervous system,a long reflexive pathway has an advantage over a short reflexive pathway in the fact that ________.

The function of goblet cells is to ________.

The chemical and mechanical processes of food breakdown are called ________.

Hormones or paracrines that inhibit gastric secretion include ________.

Chief cells ________.

Define constipation and diarrhea.Note possible causes of each.

The longest portion of the small intestine is the ________.

Figure 23.1 Using Figure 23.1, match the following: -Smooth muscle layer.

The enterohepatic circulation reabsorbs bile salts in the distal portion of the small intestine (ileum).All of the following statements about the enterohepatic circulation are true except one.Select the statement below that is not true of the enterohepatic circulation?

You have just eaten a meal high in complex carbohydrates.Which of the following enzymes will help to digest the meal?

A woman is brought to an emergency room complaining of severe pain in her left iliac region.She claims previous episodes and says that the condition is worse when she is constipated,and is relieved by defecation.A large,tender mass is palpated in the left iliac fossa and a barium study reveals a large number of diverticula in her descending and sigmoid colon.What are diverticula,and what is believed to promote their formation? Does this woman have diverticulitis or diverticulosis? Explain.

Figure 23.3 Using Figure 23.3, match the following: -Main function is to filter and process the nutrient-rich blood delivered to it.

Figure 23.2 Using Figure 23.2, match the following: -Cell type specialized to secrete mucus into the lumen of the intestinal tract.

Generally the hormones secretin and cholecystokinin which are released by duodenal enteroendocrine cells will ________.