Question

multiple - choice question
what is the specialized protection setup that blocks many molecules of crossing in to the brain?
brain ventricles
blood brain barrier
lymph nodes
meninges

Explanation:

The blood - brain barrier is a specialized protection mechanism that prevents many molecules from entering the brain, safeguarding its delicate environment. Brain ventricles are cavities filled with cerebrospinal fluid, lymph nodes are part of the immune system, and meninges are the protective membranes covering the brain and spinal cord, none of which primarily block molecular entry into the brain.

Answer:

B. blood brain barrier