Q: Which of the following best describes the three layers of the glomerular filtration barrier in the kidney?

$$\text{Fenestrated endothelium} \rightarrow \text{Glomerular basement membrane (GBM)} \rightarrow \text{Podocyte filtration slits}$$

Question 1

A patient presents with acute paracetamol overdose. Which zone of the liver acinus is most susceptible to necrosis in this scenario, and why?

Accepted Answer

Zone 3, because it is furthest from the portal triad and has the lowest oxygenation, making it most vulnerable to toxic injury.

Question 2

Which of the following best describes the function of quiescent hepatic stellate cells in the liver?

Accepted Answer

They store vitamin A in lipid droplets within the space of Disse.

Question 3

A liver biopsy stained with Perls' Prussian Blue reveals blue granules within hepatocytes. What is the most likely diagnosis?

Accepted Answer

Haemochromatosis, due to genetic iron overload

Question 4

Which of the following is a hallmark microscopic feature of cirrhosis in the liver?

Accepted Answer

Thick bands of mature fibrous tissue and nodules of regenerative hepatocytes

Question 5

A 45-year-old man with chronic hepatitis C develops a primary liver tumor. Which of the following statements is most accurate regarding hepatocellular carcinoma (HCC)?

Accepted Answer

Only a minority of patients are suitable for surgical resection due to tumor spread.

Question 6

Which of the following stains is used to identify amyloid deposits in a kidney biopsy, and what is the characteristic appearance under polarized light?

Accepted Answer

Congo Red stain; apple-green birefringence

Question 7

A histological section of the kidney shows a tubule with intensely eosinophilic cytoplasm, a narrow lumen, and a prominent brush border. Which segment is this, and what is its primary function?

Accepted Answer

Proximal convoluted tubule; active reabsorption of glucose, amino acids, and water

Question 8

Which of the following best describes the three layers of the glomerular filtration barrier in the kidney?

Accepted Answer

$$	ext{Fenestrated endothelium} ightarrow 	ext{Glomerular basement membrane (GBM)} ightarrow 	ext{Podocyte filtration slits}$$

Question 9

A patient with chronic kidney disease undergoes a biopsy. Which special stain would best highlight thickened glomerular basement membranes and brush borders of the proximal tubules?

Accepted Answer

Periodic Acid-Schiff (PAS) stain

Question 10

Which of the following statements about the juxtaglomerular apparatus (JGA) is correct?

Accepted Answer

Juxtaglomerular cells secrete renin in response to low sodium detected by the macula densa.

Question 11

A histological section of the liver shows binucleated, polygonal cells with eosinophilic cytoplasm arranged in plates. What is the most likely identity of these cells, and what is a classic feature seen on H&E staining?

Accepted Answer

Hepatocytes; binucleation and pink (eosinophilic) cytoplasm

Question 12

Which of the following best explains the difference between haemochromatosis and haemosiderosis?

Accepted Answer

Haemochromatosis is genetic iron overload with parenchymal deposition; haemosiderosis is secondary iron overload with reticuloendothelial deposition.

Question 13

A kidney biopsy is stained with PA Silver and shows spikes and serrations in the basement membrane. What is the most likely diagnosis?

Accepted Answer

Membranous nephropathy

Question 14

Which of the following is TRUE regarding the direction of bile flow in the liver relative to blood flow in the sinusoids?

Accepted Answer

Bile flows in the opposite direction to blood in the sinusoids.

Question 15

A patient with obstructive jaundice is found to have golden-brown pigment accumulation in the liver. Which stain would best highlight this pigment, and what is the pigment most likely composed of?

Accepted Answer

H&E; stain; bile pigment

Question 16

Which of the following best describes the role of Kupffer cells in the liver?

Accepted Answer

They are sinusoidal macrophage-like cells that recycle iron from senile red blood cells.

Question 17

Which of the following is a key histological difference between the proximal convoluted tubule (PCT) and the distal convoluted tubule (DCT) in the kidney?

Accepted Answer

PCT has a narrow lumen with a prominent brush border; DCT has a wide lumen and pale cytoplasm.

Question 18

A pathologist is examining a kidney biopsy for immune complex deposition. Which technique is most appropriate, and what type of tissue section is required?

Accepted Answer

Immunofluorescence on frozen section

Question 19

Which of the following best describes the location and function of arcuate arteries in the kidney?

Accepted Answer

They are found at the corticomedullary junction and serve as a landmark for distinguishing cortex from medulla.

Question 20

A patient with proteinuria is found to have damage to the podocyte filtration slits in the glomerulus. Which of the following best explains the consequence of this damage?

Accepted Answer

Leakage of proteins into the urine due to loss of the final molecular sieve

Liver and Kidney: Histology, Pathology, and Special Stains – Exam-Ready Study Notes

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