Q:

Which of the following statements about the blood-brain barrier (BBB) is correct?

waelhammad
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2022-10-19
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Which of the following statements about the blood-brain barrier (BBB) is correct?

  1. The BBB prevents fl uctuations of hormone and ion concentrations in blood from affecting the brain.
  2. It is formed by Schwann cells wrapping around capillaries.
  3. The brain is supported by (it fl oats in) the BBB.
  4. The BBB is formed by the choroid plexus.
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waelhammad
2022-10-19
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A: Hormones and ions cannot pass through the BBB. (It is astrocytes, not Schwann cells that from part of the BBB; the brain fl oats on CSF; CSF is formed by the choroid plexus). 

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