<prompt> Effectiveness of blood brain barrier is byThick basement membraneTight arrangement of astrocytesTight endothelial functionMicroglial cell  <response>: 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. Ref: guyton and hall textbook of medical physiology 12 edition page number:671,672,673 