👉 The host fluid, also known as cerebrospinal fluid (CSF), is a clear, colorless liquid that circulates within the central nervous system (CNS) of vertebrates, including humans. Produced by the choroid plexus within the ventricles of the brain, it serves multiple critical functions: providing a protective cushion for the brain and spinal cord, maintaining a stable chemical environment for neuronal activity, facilitating the removal of waste products, and supporting the transport of nutrients and hormones. The host fluid also plays a role in immune defense by housing immune cells that help protect against pathogens. It circulates through the subarachnoid space surrounding the brain and spinal cord, ensuring that these vital organs remain well-protected and adequately nourished.
