<P> The blood -- brain barrier ( BBB ) is a highly selective semipermeable border that separates the circulating blood from the brain and extracellular fluid in the central nervous system ( CNS ) . The blood -- brain barrier is formed by endothelial cells of the capillary wall , astrocyte end - feet ensheathing the capillary , and pericytes embedded in the capillary basement membrane . This system allows the passage of water , some gases , and lipid - soluble molecules by passive diffusion , as well as the selective transport of molecules such as glucose and amino acids that are crucial to neural function . Specialized structures participating in sensory and secretory integration within neuronal networks -- the circumventricular organs and choroid plexus -- do not have a blood -- brain barrier . </P>
<P> The blood -- brain barrier ( BBB ) is a highly selective semipermeable border that separates the circulating blood from the brain and extracellular fluid in the central nervous system ( CNS ) . The blood -- brain barrier is formed by endothelial cells of the capillary wall , astrocyte end - feet ensheathing the capillary , and pericytes embedded in the capillary basement membrane . This system allows the passage of water , some gases , and lipid - soluble molecules by passive diffusion , as well as the selective transport of molecules such as glucose and amino acids that are crucial to neural function . Specialized structures participating in sensory and secretory integration within neuronal networks -- the circumventricular organs and choroid plexus -- do not have a blood -- brain barrier . </P>
what type of cell contributes to the blood-brain barrier in the central nervous system
what type of cell contributes to the blood-brain barrier in the central nervous system
endothelial cells
endothelial cells