EPPP Biological Bases of Behavior Practice Exam 2025 - Free Practice Questions and Study Guide

The ventricles in the brain primarily serve to store cerebrospinal fluid (CSF). They are a system of interconnected cavities that are filled with this clear fluid, which plays a vital role in protecting the brain, maintaining intracranial pressure, and facilitating the exchange of nutrients and waste. The presence of CSF in the ventricles allows for a cushioned environment that aids in mechanical protection against injury. Additionally, CSF circulates throughout the brain and spinal cord, contributing to various physiological processes.

The other functions suggested by the other options, while relevant to brain structure, do not accurately capture the primary role of the ventricles. The ventricles do not house brain tissue, as they are empty spaces within the brain; their primary purpose is fluid containment rather than structural support or connection between parts of the brain. Therefore, their main function is indeed to store cerebrospinal fluid.