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Question: The outer membrane surrounding the brain is known as dura mater. The middle layer is known as the arachnoid layer and the inner layer is the pia mater. These three layers form the blood-brain barrier which determines which chemicals will reach the brain. true or false
Mostly true, but there's one part of your statement that's not quite right. While the dura mater, arachnoid mater, and pia mater do form the meninges, which is a set of coverings for the brain and spinal cord, they are not primarily responsible for forming the blood-brain barrier. The blood-brain barrier is mainly formed by specialized cells in the walls of brain capillaries (endothelial cells), which limit the passage of substances from the bloodstream into the brain.
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