The mechanism that regulates the movement of substances into and out of the cells of the brain is the
A)cerebrospinal fluid.
B)reticular formation.
C)tectum.
D)blood-brain barrier.
E)brain stem.

Question

Quizplus · Accepted Answer

The blood-brain barrier is a specialized mechanism that regulates the movement of substances into and out of the cells of the brain. It is composed of endothelial cells that form tight junctions and selectively allow certain molecules to pass through while blocking others. This helps to protect the brain from potentially harmful substances while allowing essential nutrients and chemicals to enter.

The Mechanism That Regulates the Movement of Substances into and Out