Which of these is the main function of the blood-brain barrier?

Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood
Prevents any molecules from entering the cerebrospinal fluid from the blood
Coordinates the nervous and endocrine systems by influencing the pituitary gland
Filters sensory input and keeps the cerebral cortex in an alert state


Protects the CNS by selecting the substances that can enter the cerebrospinal fluid from the blood
Explanation:
The reticular activating system filters sensory input and keeps the cerebral cortex in an alert state, while the hypothalamus coordinates the nervous and endocrine systems by influencing the pituitary gland.

Biology & Microbiology

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