The defense membrane used by the brain that controls the passage of substances from the blood into the central nervous system is referred to as the:
A) epinephrine block.
B) stress hormone.
C) blood-brain barrier.
D) norepinephrine block.

Question

Quizplus · Accepted Answer

The blood-brain barrier is a highly selective semipermeable border that separates the circulating blood from the brain and extracellular fluid in the central nervous system (CNS). This barrier allows the passage of some substances while blocking others, thus protecting the brain from potentially harmful chemicals and pathogens.

The Defense Membrane Used by the Brain That Controls the Passage