Which of the following statements about the blood-brain barrier is incorrect?

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Tight junctions at active sites contain gaps.Active sites have no gaps between tight junctions.The membrane exhibits reduced activity.Fibronectin acts as a diffusion barrier.

Explanation

The blood-brain barrier is characterized by continuous tight junctions without gaps at active sites, ensuring selective permeability. Therefore, the statement that there are gaps between tight junctions at active sites is false. Other statements correctly describe the barrier's properties, including reduced membrane activity and fibronectin's role in restricting diffusion.