👉 The fluid in the brain, primarily composed of cerebrospinal fluid (CSF), acts as a vital medium for several key functions. It cushions the brain and spinal cord, providing a protective buffer against impacts and reducing friction during movement. CSF also facilitates the removal of metabolic waste products from neural tissues, maintaining optimal brain function and health. Additionally, it plays a role in the transport of nutrients and hormones between the blood and brain, ensuring that neurons receive the necessary resources to operate effectively. This fluid's dynamic nature allows for constant exchange and regulation, contributing significantly to the brain's overall fluidity and adaptability.