Final answer:
Cerebrospinal fluid returns to regular circulation by being reabsorbed into the blood at the arachnoid granulations within the dural sinuses, aiding in waste removal and providing a cushion for the CNS.
Explanation:
Cerebrospinal fluid (CSF) returns to regular circulation by being reabsorbed back into the blood at the arachnoid granulations within the dural sinuses. CSF is produced in the ventricles of the brain, flows through the ventricular system, and eventually enters the subarachnoid space where it is reabsorbed. The flow of CSF helps remove metabolic wastes from the nervous tissues and provides a cushion for the brain and spinal cord.
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