Q: Which equation best represents the relationship between neural and hormonal control in the digestive system?

$$\text{Total Digestive Response} = \text{Neural Control} + \text{Hormonal Control}$$

Question 1

Which of the following best describes the role of the Myenteric (Auerbach's) Plexus in the digestive system?

Accepted Answer

It is primarily responsible for controlling gastrointestinal motility.

Question 2

During the cephalic phase of digestion, which of the following is most likely to occur?

Accepted Answer

Stimulation of gastric secretion triggered by the sight, smell, or thought of food.

Question 3

Which hormone is released in response to the presence of lipids and proteins in the small intestine and stimulates pancreatic enzyme secretion and gallbladder contraction?

Accepted Answer

Cholecystokinin (CCK)

Question 4

A patient has a lesion affecting the submucosal plexus. Which digestive function is most likely to be impaired?

Accepted Answer

Control of local secretion and blood flow in the GI tract

Question 5

Which of the following best explains the effect of the enterogastric reflex?

Accepted Answer

It inhibits gastric secretion and motility due to duodenal distension.

Question 6

If the sympathetic nervous system is activated, what is the expected effect on digestive activity?

Accepted Answer

Decreased digestive activity due to inhibition of motility and secretion

Question 7

Which of the following scenarios best illustrates intrinsic neural control of the digestive system?

Accepted Answer

Myenteric plexus coordinating peristalsis independently of the CNS

Question 8

A patient is unable to initiate the defecation reflex voluntarily. Which structure is most likely impaired?

Accepted Answer

External anal sphincter

Question 9

Which of the following is TRUE regarding the role of secretin in digestion?

Accepted Answer

It promotes bicarbonate secretion from the pancreas in response to acidic chyme entering the duodenum.

Question 10

Which equation best represents the relationship between neural and hormonal control in the digestive system?

Accepted Answer

$$	ext{Total Digestive Response} = 	ext{Neural Control} + 	ext{Hormonal Control}$$

Question 11

A patient presents with delayed gastric emptying. Which hormone is most likely elevated?

Accepted Answer

Cholecystokinin (CCK)

Question 12

Which of the following best describes the function of the gastrocolic reflex?

Accepted Answer

It stimulates mass movement in the colon in response to stomach stretch.

Question 13

Which of the following is a direct effect of the enterogastric reflex?

Accepted Answer

Decreased gastric secretion and motility

Question 14

Which of the following best explains why thinking about food can initiate digestive activity?

Accepted Answer

It activates the cephalic phase via the central nervous system.

Question 15

Which of the following is most likely to occur if the vagus nerve is damaged?

Accepted Answer

Decreased gastric activity due to loss of parasympathetic stimulation

Question 16

Which of the following best describes the role of the enteric nervous system?

Accepted Answer

It coordinates local digestive activity independently of the CNS.

Question 17

Which of the following is a correct sequence of events during the intestinal phase of digestion?

Accepted Answer

Acidic chyme enters the duodenum → Secretin is released → Pancreatic bicarbonate secretion increases

Question 18

Which of the following best describes the effect of the sympathetic nervous system on the digestive tract?

Accepted Answer

It decreases digestive activity by inhibiting motility and secretion.

Question 19

Which of the following is TRUE regarding the defecation reflex?

Accepted Answer

It is triggered by mass movement in the colon and involves both involuntary and voluntary components.

Question 20

Which of the following best describes the relationship between the enteric nervous system and the autonomic nervous system?

Accepted Answer

The enteric nervous system operates independently but can be modulated by the autonomic nervous system.

Digestive Neural and Hormonal Controls: Study Guide

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