23. The Digestive System

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

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.

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

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

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.

Which regulatory chemical stimulates gastric gland activity and motility?

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

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

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

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

Multiple ChoiceMore than one choice may apply.Which of the following terms are synonyms?a. Gastrointestinal tractb. Digestive systemc. Digestive tractd. Alimentary canal

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

Label the four layers of the digestive tract in the following figure. a. ___b. ___c. ___d. ___