23. The Digestive System

A bolus is found in which alimentary tract organ or organ(s)?

What are the six main processes of the digestive system?

In which the following would you expect the most chemical digestion to occur?

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

The mucosa from the stomach to the anus consists of an inner layer of stratified columnar epithelium.

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

Label the three segments of the small intestine in the following figure.

<IMAGE>

a. ___

b. ___

c. ___

Which of the following statements about accessory organ secretions is not true?

a. Hepatocytes produce bile, which drains out of the liver via the common hepatic ducts.

b. Saliva contains secretory IgA and lysozyme, which play an important role in preventing the growth of pathogenic bacteria in the oral cavity.

c. Pancreatic juice contains digestive enzymes and bicarbonate ions to neutralize the acidic chyme.

d. The gallbladder produces bile, which drains out of the gallbladder via the cystic duct.

Drugs with anticholinergic side effects block ACh receptors in the peripheral nervous system, including those on digestive organs. Predict the effects such drugs would have on motility and secretion on the specific organs of the digestive system.

Of the following functions of the digestive system, which function is the responsibility of only one organ?

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

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.