Understanding What Are the Four Exceptions to the Blood-Brain Barrier?
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5 min read
The human brain is typically shielded from the bloodstream by a highly selective barrier, a defense mechanism that keeps most substances from entering. Yet, there are specific anatomical regions where this protection is strategically and intentionally absent. Understanding **what are the four exceptions to the blood-brain barrier** is crucial for comprehending how the brain monitors peripheral signals and secretes hormones into the bloodstream.
