Final answer:
The statement that narrow passageways connect the ventricles for CSF flow is true. CSF is produced by the choroid plexus in the ventricles and flows through the interventricular foramina and the cerebral aqueduct, before being reabsorbed into the blood.
Step-by-step explanation:
The statement "Narrow passageways connect the ventricles together, so that CSF flows freely inside the ventricular system" is true. The ventricular system is crucial for the circulation of cerebrospinal fluid (CSF) within the brain. There are four ventricles: the two lateral ventricles are connected to the third ventricle by the interventricular foramina, and then the CSF flows through the cerebral aqueduct into the fourth ventricle. Additional CSF is produced at each stage, and the fluid keeps moving through the system.
From the fourth ventricle, the CSF can enter the subarachnoid space through the median and lateral apertures. The choroid plexus present in all four ventricles produces CSF, contributing to about 500 milliliters daily. The continuous production and flow of CSF help to remove metabolic wastes and maintain the CNS environment. Ultimately, CSF is reabsorbed into the blood at the arachnoid granulations, completing its circulation cycle.