Histology Certification Organ Histology 4

Question 1

Which cardiac structure, visible on H&E sections, contains Purkinje fibers recognized by their large size and pale, glycogen-rich cytoplasm?

Accepted Answer

Subendocardial layer of the ventricle

Answer

Purkinje fibers run in the subendocardial layer of the ventricles and appear larger and paler than ordinary cardiomyocytes due to abundant glycogen.

Question 2

The cortex of the lymph node contains primary and secondary follicles populated predominantly by which cell type?

Accepted Answer

B lymphocytes

Answer

Lymph node follicles are B-cell zones; secondary follicles develop germinal centers where antigen-stimulated B cells undergo clonal expansion.

Question 3

In the pancreas, the islets of Langerhans are best distinguished from acinar tissue by:

Accepted Answer

Their pale-staining clusters of polyhedral cells lacking zymogen granules

Answer

Islet cells form pale, loosely arranged clusters surrounded by a fine capillary network, contrasting with the basophilic, granule-rich acinar cells.

Question 4

The adventitia of the urinary bladder is replaced by serosa (peritoneum) on which surface?

Accepted Answer

Posterior superior surface

Answer

The superior/posterior surface of the bladder is covered by peritoneum (serosa), while other surfaces have adventitia only.

Question 5

Which cells in the respiratory bronchiole and terminal bronchiole secrete Clara (Club) cell secretory protein and detoxify inhaled substances?

Accepted Answer

Club (Clara) cells

Answer

Club cells are dome-shaped, non-ciliated epithelial cells that produce secretory proteins, detoxify xenobiotics, and serve as progenitors for airway epithelium.

Histology Certification Practice Test

Histology Certification Practice Test

Histology Certification Organ Histology 4