Blood Brain Barrier is being breached , Why your seeing an uptick in car accidents, Violence, The blood-brain barrier (BBB) is a highly specialized network of tightly packed cells that line the walls of blood vessels in the brain and spinal cord. Its primary function is to protect the brain from harmful substances in the blood while allowing essential nutrients and oxygen to pass through. The BBB is made up of three main components: endothelial cells, pericytes, and astrocytes. Endothelial cells are the main cell type that form the lining of blood vessels. Pericytes are cells that wrap around the blood vessels and help to regulate blood flow. Astrocytes are star-shaped cells that provide support and nourishment to the neurons in the brain. The BBB works by selectively allowing certain substances to cross from the bloodstream into the brain. This is accomplished through a combination of physical barriers, transport mechanisms, and enzymes that break down or modify substances that attempt to enter the brain. One of the key physical barriers of the BBB is the tight junctions between endothelial cells. These junctions form a nearly impenetrable seal that prevents most substances from passing between the cells. Only small, lipid-soluble molecules can diffuse across the endothelial cell membrane and enter the brain. To regulate the movement of substances across the BBB, specialized transport mechanisms exist. For example, glucose, which is essential for energy production in the brain, is transported across the BBB by specific transporter proteins. Similarly, amino acids, which are the building blocks of proteins, are also transported across the BBB by specialized transporters. In addition to physical barriers and transport mechanisms, the BBB also contains enzymes that break down or modify certain substances that attempt to enter the brain. For example, the enzyme monoamine oxidase (MAO) breaks down neurotransmitters such as dopamine and serotonin, which can be harmful to the brain in high concentrations. The BBB also plays a critical role in protecting the brain from harmful substances in the blood. This is accomplished through a process known as selective permeability, which allows only certain substances to pass through the BBB. Substances that are allowed to cross the BBB include essential nutrients such as glucose, amino acids, and vitamins, as well as gases such as oxygen and carbon dioxide. On the other hand, substances that are harmful to the brain are kept out of the brain by the BBB. These substances include toxins, pathogens, and many drugs. For example, many chemotherapy drugs cannot cross the BBB, which makes treating brain tumors more challenging. The selective permeability of the BBB is achieved through a combination of physical barriers and transport mechanisms. One of the most important physical barriers is the tight junctions between endothelial cells, which prevent most substances from passing between cells. Additionally, the BBB contains specialized transporters that selectively transport essential nutrients across the BBB while blocking harmful substances. Overall, the BBB plays a critical role in protecting the brain from harmful substances in the blood while allowing essential nutrients and oxygen to pass through. Although the BBB can be a barrier to certain drugs and treatments, researchers are exploring ways to overcome this barrier in order to develop more effective treatments for neurological disorders. ... https://www.youtube.com/watch?v=vgis4EHlmK0

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