Nokea
During the process of defecation, which of the following changes takes place?
- A. Relaxation of the internal anal sphincter
- B. Contraction of the external anal sphincter
- C. Relaxation of the rectal smooth muscle
- D. Decreased intra-abdominal pressure compared to the resting state
Correct Answer: A
Rationale: The internal anal sphincter relaxes reflexively during defecation to allow stool passage, while the external sphincter is voluntarily controlled.
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Match: Villi
- A. projections in the small intestine that absorb nutrients
- B. storage structures
- C. enzyme producers
- D. muscular layers
Correct Answer: A
Rationale: Villi are finger-like projections in the small intestine that increase surface area for efficient nutrient absorption.
The greater omentum does not participate in:
- A. secretion of enzymes
- B. support and cushioning of the viscera
- C. storage of lipids
- D. protection against the spread of infection
Correct Answer: A
Rationale: The greater omentum provides structural support, lipid storage, and protection against infection spread, but it does not secrete enzymes.
The small intestine of a person contains a lower concentration of glucose than is present in the blood. The cells of the villi absorb glucose. By which process is the glucose absorbed?
- A. by active transport against the concentration gradient
- B. by active transport down the concentration gradient
- C. by diffusion against the concentration gradient
- D. by diffusion down the concentration gradient
Correct Answer: A
Rationale: Glucose absorption in the small intestine occurs through active transport, particularly when the concentration of glucose is higher in the blood than in the intestine. This requires energy to move glucose against its concentration gradient.
Based on knowledge of anatomy and physiology, are there any diet considerations that the student should include in the teaching plan?
- A. Low-fat, enzyme-supplemented diet
- B. High-fiber diet only
- C. Low-protein diet
- D. No dietary changes needed
Correct Answer: A
Rationale: Post-pancreatectomy, a low-fat diet with enzyme supplements is necessary due to impaired digestion.
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?
- A. Chief cells
- B. G cells
- C. Goblet cells
- D. Parietal cells
Correct Answer: D
Rationale: Parietal cells produce intrinsic factor, necessary for vitamin B12 absorption; their absence after gastrectomy necessitates B12 injections.