Chemotherapy Biotherapy Certification ONS Practice Test 2025 - Free Practice Questions and Study Guide

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What is the primary function of the blood-brain barrier?

Facilitates nutrient transport

Protects the brain from foreign substances

The primary function of the blood-brain barrier is to protect the brain from foreign substances. This barrier is a selective permeability barrier formed by tight junctions between endothelial cells in the brain's blood vessels, effectively preventing potentially harmful substances, such as pathogens, toxins, and even some medications, from entering the cerebral tissue. This protective mechanism is crucial for maintaining the brain's delicate environment, which is essential for proper neurological function. The integrity of the blood-brain barrier keeps pollutants and microorganisms in the bloodstream from reaching brain tissue, which helps to safeguard neuronal health and overall cognitive function. The other options identify important processes in general biological functions, but they don't encompass the critical protective role that the blood-brain barrier plays in the central nervous system.

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Regulates intracranial pressure

Encourages neurotransmitter balance

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