You want to have it stable and working perfectly whether you are sleeping or being chased by a tiger,' Lester Drewes of the University of Minnesota in Duluth, US, explains. The blood-brain barrier, or BBB, consists of the endothelial cells lining the blood vessels in the brain.These fortress cells are glued together very tightly and, in contrast to other organs and tissues, there are no chinks between them for blood-borne materials to leak into brain tissue.ou want to have it stable and working perfectly whether you are sleeping or being chased by a tiger,' Lester Drewes of the University of Minnesota in Duluth, US, explains. The blood-brain barrier, or BBB, consists of the endothelial cells lining the blood vessels in the brain.
About North Georgia. Leaf change brings thousands of people into the north Georgia mountains every year. In response to a number of inquiries, we have come up with our tips on observing the beauty of this yearly show of color and our favorite places to witness this splendid time of the year. The optimum time to see the leaf change in the north Georgia mountains is normally the last weekend in October.
Why do leaves change color in the fall season? In some areas of the world, the weather changes in the fall, making the air turn cold. During this time, many leaves also change colors. Why does this happen? First let's think about why some trees drop their leaves before winter.