Blood-brain Barrier Theory

The Blood-Brain Barrier (BBB) Theory refers to a selective barrier formed by tightly packed cells lining the blood vessels in the brain. It protects the brain by allowing essential nutrients to pass through while blocking harmful substances, such as toxins and pathogens. This barrier is crucial for maintaining the brain's environment, ensuring proper function. However, it can also complicate the treatment of brain diseases, as many medications cannot easily cross this barrier. Understanding the BBB helps researchers develop new therapies for conditions like Alzheimer's and brain tumors, balancing protection and treatment access.