💊 PCAT Exam Prep

The blood-brain barrier is primarily maintained by:

A Red blood cells
B Tight junctions between endothelial cells of brain capillaries
C Neurons
D Glial cells only

✓ Correct Answer: Option B

Tight junctions between cerebral capillary endothelial cells form the BBB, restricting passage of substances.

💡 Why is B) the correct answer?

The correct answer to the question "The blood-brain barrier is primarily maintained by:" is Option B: Tight junctions between endothelial cells of brain capillaries.

The other options — A) Red blood cells, C) Neurons, D) Glial cells only — are incorrect for this PCAT Exam Prep question. As explained above: Tight junctions between cerebral capillary endothelial cells form the BBB, restricting passage of substances.

📚 About This PCAT Exam Prep Practice Question

This 2-level PCAT Exam Prep question from the Biological Processes topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free PCAT Exam Prep practice test or use flashcards for spaced repetition review.

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