This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Blood testis barrier is formed by the: 
Select and explain. 
A. Leydig cells, B. Seoli cells, C. Germ cells, D. All of the above
B: Seoli cells
Answer: B: Seoli cells 
Explanation: Blood-Testis Barrier a barrier separating the blood from the seminiferous tubules, consisting of special junctional complexes between adjacent Seoli cells near the base of the seminiferous epithelium.Other barriers in the body:Placental barrier term sometimes used for the placental membrane, because it prevents the passage of some materials between the maternal and fetal blood.Blood-aqueous barrier the physiologic mechanism that prevents exchange of materials between the chambers of the eye and the blood.Blood-brain barrier, blood-cerebral barrier the selective barrier separating the blood from the parenchyma of the central nervous system. Abbreted BBB