ATI RN
Anatomy And Physiology Digestive System Test Questions Questions
Question 1 of 5
Kupffer's cells are found in ______________.
Correct Answer: A
Rationale: Kupffer cells are specialized macrophages located in the liver, where they play a role in filtering blood and immune response.
Question 2 of 5
Which nerve is primarily responsible for the neural control of the gastric phase, including the stimulation of gastric secretions?
Correct Answer: B
Rationale: The vagus nerve (cranial nerve X) is the primary nerve responsible for parasympathetic control of the stomach, stimulating gastric secretions and motility during the gastric phase.
Question 3 of 5
Following a diagnosis of Zollinger-Ellison syndrome, a 70-year-old woman undergoes gastrectomy. Her physician informs her that she will require lifelong intramuscular vitamin B12 injections. Which specific type of cells' absence is responsible for the need for vitamin replacement?
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, necessary for vitamin B12 absorption; their absence after gastrectomy necessitates B12 injections.
Question 4 of 5
During the process of defecation, which of the following changes takes place?
Correct Answer: A
Rationale: The internal anal sphincter relaxes reflexively during defecation to allow stool passage, while the external sphincter is voluntarily controlled.
Question 5 of 5
Why is pepsin not secreted into the stomach?
Correct Answer: B
Rationale: Pepsin is secreted into the stomach as pepsinogen by chief cells and activated by stomach acid. It does not digest the stomach due to the protective mucus layer.