Functions of the BBB. The BBB has several important functions: 1  Protects the brain from foreign substances in the blood that may injure the brain. 2  Protects the brain from hormones and neurotransmitters in the rest of the body.unctions of the BBB. The BBB has several important functions: 1  Protects the brain from foreign substances in the blood that may injure the brain. 2  Protects the brain from hormones and neurotransmitters in the rest of the body.
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.
The Science of Color in Autumn Leaves. As the days get cooler and frost is in the air, deciduous trees and shrubs put on an autumn show in all shades of red, yellow, purple, and brown. The splendor of crisp fall days and vibrant leaves brings to mind memories for nearly everyone who lives in an area where deciduous forests are the dominant vegetation. In many parts of the country, autumn leaves are an important factor in tourism. Many think that cool weather or frost cause the leaves to change color. While temperature may dictate the color and its intensity, it is only one of many environmental factors that play a part in painting deciduous woodlands in glorious fall colors.