Many chemicals are kept from passing from the circulatory system of the CNS into CNS neurons by
A) reflexology.
B) tolerance.
C) the blood-brain barrier.
D) the cerebrospinal fluid.
E) withdrawal.

Question

Quizplus · Accepted Answer

The blood-brain barrier is a highly selective membrane that prevents many potentially harmful chemicals and pathogens from passing from the bloodstream into the brain and spinal cord tissue. This barrier is formed by specialized cells in the walls of capillaries that supply blood to the CNS, and it helps to maintain the delicate chemical balance needed for proper brain function.

Many Chemicals Are Kept from Passing from the Circulatory System