Final answer:
The main function of cerebrospinal fluid (CSF) is to cushion and protect the brain and spinal cord, while also circulating nutrients and removing waste products from the central nervous system (CNS).
Step-by-step explanation:
The main function of the cerebrospinal fluid (CSF) is to cushion and protect the brain and spinal cord. It acts as a liquid cushion by surrounding the entire central nervous system (CNS) and filling the space between the meninges. CSF also circulates nutrients and removes waste products from the CNS, helping to maintain a balanced internal environment. CSF is produced continuously in the ventricles of the brain and circulates throughout the CNS.
It is then reabsorbed by the bloodstream to maintain a proper fluid balance. If there is an imbalance, such as too much CSF production or blockage of its flow, it can lead to conditions like hydrocephalus, which can put pressure on the brain.