What Three Key Substances Cross the Blood-Brain Barrier?

Discover the essential items that can reach the brain, including glucose and oxygen, and learn how they support brain function.

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Glucose, oxygen, and certain amino acids can cross the blood-brain barrier. These essential substances are transported to fuel brain function, whereas harmful substances are typically blocked to protect brain tissue.

FAQs & Answers

  1. What is the blood-brain barrier? The blood-brain barrier is a selective barrier that separates the circulating blood from the brain and protects brain tissue.
  2. How does glucose benefit brain function? Glucose is the primary energy source for the brain, essential for maintaining cognitive functions.
  3. Are there substances that cannot cross the blood-brain barrier? Yes, many harmful substances, like toxins and certain pathogens, are blocked by the blood-brain barrier to protect the brain.

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