Histology Certification Organ Histology 3

Question 1

The tunica media of large elastic arteries such as the aorta is characterized by:

Accepted Answer

Alternating layers of elastic lamellae and smooth muscle

Answer

Large elastic arteries have a thick media composed of concentric elastic lamellae alternating with smooth muscle cells that buffer pulsatile blood flow.

Question 2

In the small intestine, which cells secrete defensins and lysozyme to protect the intestinal crypts?

Accepted Answer

Paneth cells

Answer

Paneth cells reside at the base of intestinal crypts and secrete antimicrobial peptides including defensins and lysozyme.

Question 3

The glomerular podocyte foot processes are interconnected by which specialized junction?

Accepted Answer

Slit diaphragm

Answer

Slit diaphragms bridge adjacent foot processes and are composed of nephrin, podocin, and other proteins, forming a key filtration barrier.

Question 4

Which histological stain is most appropriate for identifying reticular fibers forming the framework of lymph nodes and spleen?

Accepted Answer

Gomori reticulin (silver impregnation)

Answer

Gomori reticulin stain selectively impregnates type III collagen (reticular fibers) with silver, rendering them black.

Question 5

The zona pellucida surrounding an oocyte is composed primarily of:

Accepted Answer

Glycoproteins ZP1, ZP2, and ZP3

Answer

The zona pellucida is a glycoprotein coat synthesized by the oocyte, consisting of ZP1, ZP2, and ZP3 that mediate sperm binding.

Histology Certification Practice Test

Histology Certification Practice Test

Histology Certification Organ Histology 3