Organ Histology Flashcards
7 cards from real Histology Certification practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Organ Histology flashcards as text
Which layer of the skin is responsible for the continuous production of keratinocytes through mitotic division?
Answer: Stratum basale
The stratum basale (germinativum) is the deepest epidermal layer and contains proliferative keratinocytes attached to the basement membrane.
The exocrine portion of the pancreas drains into intercalated ducts that are distinguished by their lining of:
Answer: Low cuboidal to flattened epithelial cells
Intercalated ducts are the smallest pancreatic ducts, lined by low cuboidal to squamous cells, and extend into acini as centroacinar cells.
The spleen's white pulp is organized around which vascular structure?
Answer: Central arteriole
White pulp consists of periarteriolar lymphoid sheaths (PALS) and follicles that surround the central arteriole in each splenic corpuscle.
Which specialized junctions at the apical surface of intestinal enterocytes form the primary barrier to paracellular transport?
Answer: Tight junctions (zonulae occludentes)
Tight junctions seal the lateral intercellular space at the apical surface of enterocytes, limiting paracellular diffusion of solutes.
Parafollicular (C) cells of the thyroid gland are derived from which embryological structure and produce which hormone?
Answer: Neural crest cells via ultimobranchial body; calcitonin
C cells originate from neural crest cells incorporated into the ultimobranchial body and secrete calcitonin in response to elevated serum calcium.
In the ovary, the theca interna cells of the developing follicle are responsible for synthesizing which hormone under LH stimulation?
Answer: Androgens (androstenedione) as precursors for estrogen
LH stimulates theca interna cells to produce androgens (androstenedione/testosterone) that diffuse to granulosa cells for aromatization to estradiol.
Meissner's corpuscles are encapsulated mechanoreceptors found in which layer of the skin and are specialized for detecting:
Answer: Dermis papillary layer; light touch and two-point discrimination
Meissner's corpuscles reside in the dermal papillae of the papillary dermis and are rapidly adapting receptors for fine touch and texture discrimination.