Based on scientific research and analysis, the true statements of the brain barrier system include "Brain barrier is necessary because brain tissue is irreplaceable, and therefore must be well protected."
The brain Carrier system is a term that is used to describe the blood vessels that vascularize the central nervous system (CNS) and it is known to possess unique properties, termed the blood-brain barrier,
Generally, the brain barrier system allows these vessels to tightly oversee the movement of ions, molecules, and cells between the blood and the brain.
Hence, in this case, it is concluded that the Brain barrier systems help the body protect the brain against any form of harmful substances.
Learn more about the Brain Barrier system here: https://brainly.com/question/14203646
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