23. Digestive System

Which of the following is NOT an accessory organ of the digestive system?

Which of the following statements about the mesentery is INCORRECT?

The peritoneal cavity a. is the same thing as the abdominopelvic cavity, b. is filled with air, c. like the pleural and pericardial cavities is a potential space containing serous fluid, d. contains the pancreas and all of the duodenum.

Multiple Choice More than one choice may apply. Which of the following terms are synonyms? a. Gastrointestinal tract b. Digestive system c. Digestive tract d. Alimentary canal

Multiple Choice More than one choice may apply. A digestive organ that is not part of the alimentary canal is the a. stomach. b. liver. c. small intestine. d. large intestine. e. pharynx.

The outer layer of the digestive tract is known as the (a) serosa, (b) mucosa, (c) submucosa, (d) muscularis.

Multiple Choice More than one choice may apply. The GI tube tissue layer responsible for the actions of segmentation and peristalsis is the a. serosa. b. mucosa. c. muscularis externa. d. submucosa.

Double sheets of peritoneum that provide support and stability for the organs of the peritoneal cavity are the (a) mediastina, (b) mucous membranes, (c) omenta, (d) mesenteries.

The parasympathetic nervous system influences digestion by a. relaxing smooth muscle, b. stimulating peristalsis and secretory activity, c. constricting sphincters, d. none of these.

Label the digestive system structures in the following figure. a. ___ b. ___ c. ___ d. ___ e. ___ f. ___ g. ___ h. ___ i. ___ j. ___ k.___

The digestive juice product containing enzymes capable of digesting all four major foodstuff categories is a. pancreatic, b. gastric, c. salivary, d. biliary.

Label the four layers of the digestive tract in the following figure. a. ___ b. ___ c. ___ d. ___

Most of the digestive tract is lined by_____epithelium. (a) pseudostratified ciliated columnar, (b) cuboidal, (c) stratified squamous, (d) simple, (e) simple columnar.

Label the three segments of the small intestine in the following figure. a. ___ b. ___ c. ___

Name the six functional activities of the digestive system.

What are the six main processes of the digestive system?

Name and describe the layers of the digestive tract, proceeding from the innermost layer nearest the lumen to the outermost layer.

What three basic mechanisms regulate the activities of the digestive tract?

Make a simple line drawing of the organs of the alimentary canal and label each organ. Then add three labels to your drawing—salivary glands, liver, and pancreas—and use arrows to show where each of these organs empties its secretions into the alimentary canal.

Lara was on a diet but she could not eat less and kept claiming her stomach had a mind of its own. She was joking, but indeed, there is a 'gut brain' called the enteric nervous system. Is it part of the parasympathetic and sympathetic nervous system? Explain.

Increased parasympathetic stimulation of the intestine would result in (a) decreased motility, (b) decreased secretion, (c) decreased sensitivity of local reflexes, (d) decreased segmentation, (e) none of these.

A drop in pH below 4.5 in the duodenum stimulates the secretion of (a) secretin, (b) cholecystokinin, (c) gastrin, (d) all of these.

Which of the following is the most common cause of peritonitis?

The serous membrane that covers the external surfaces of most digestive organs is called the __________.

Which sequence below represents the correct order of the tunics of the GI tract, starting from the layer adjacent to the lumen and moving superficially?

The myenteric nerve plexus is located in which tunic of the alimentary canal?

The enteric nervous system is the in-house nerve supply of the alimentary canal.

Which regulatory chemical stimulates gastric gland activity and motility?

The short reflexes in the digestive system are stimulated by __________.