The tissue at the blue arrow corresponds to simple squamous epithelium located at which structure?

The tissue at the blue arrow corresponds to simple squamous epithelium located at which structure?

• A. Proximal tubule
• B. Distal tubule
• C. Bowman's capsule
• D. Collecting duct

Answer: (C)

Simple squamous epithelium lines surfaces where a thin, permeable barrier is needed. In the kidney, the parietal layer of Bowman's capsule is made of simple squamous cells, forming the thin outer boundary around the glomerulus. The other nephron segments are lined by simple cuboidal epithelium (proximal tubule with a dense brush border for reabsorption; distal tubule with fewer microvilli; collecting duct with cuboidal to columnar cells), so they wouldn’t show this flat, thin lining. Thus, the blue arrow points to Bowman's capsule.

Simple squamous epithelium lines surfaces where a thin, permeable barrier is needed. In the kidney, the parietal layer of Bowman's capsule is made of simple squamous cells, forming the thin outer boundary around the glomerulus. The other nephron segments are lined by simple cuboidal epithelium (proximal tubule with a dense brush border for reabsorption; distal tubule with fewer microvilli; collecting duct with cuboidal to columnar cells), so they wouldn’t show this flat, thin lining. Thus, the blue arrow points to Bowman's capsule.