But these blood vessels are different from all the other blood vessels in our body. They are lined by a strange structure called the blood-brain barrier. It closely controls what is, and is not, allowed to leave the blood supply and enter the brain.It's your own personal customs and border security.We used to think of the blood-brain barrier as some kind of biological flyscreen.hey are lined by a strange structure called the blood-brain barrier. It closely controls what is, and is not, allowed to leave the blood supply and enter the brain. It's your own personal customs and border security. We used to think of the blood-brain barrier as some kind of biological flyscreen.
Follow this guide to find the best time to see Smoky Mountain fall colors. September. Fall in the Smokies begins in September, with the emerging changes occurring above 4,000 feet. Red, orange and yellow colors can be seen on sourwood, dogwood, maple, sassafras and birch trees. Drives recommended for September viewing are Parsons Branch Road, Newfound Gap Road and Clingmans Dome Road.
A lot of it depends upon weather, the types of days that we have, the types of nights we have, said Hilton. Hilton has been a naturalist for 14 years and he tells us a lot of variables affect when the leaves change, rain being one of them. We're a little over 6 inches above normal. I don't think that's enough to have any effect on leaf color, said Hilton. We learned that we are not far off of the average timing for the leaves. Hilton says that we can expect the leaves to change around the same time as last year. If I had to make an educated guess, probably about the third week in October, said Hilton. Hilton said that even if the leaves do change early, it would not affect tourism at Bays Mountain one bit. When the leaves start changing there will definitely be people coming here. So if they peak a little earlier than usual, our crowds will also come a little earlier than usual, said Hilton.