Q:

What is the blood-brain barrier? An adaptation of the capillaries serving the brain that:

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What is the blood-brain barrier? An adaptation of the capillaries serving the brain that:


  1. prevents fat-soluble molecules from entering the brain.
  2. inhibits all substances from passing from the blood stream into the brain
  3. selectively inhibits many substances from passing from the blood stream into the brain
  4. operates from birth to prevent foreign molecules entering the brain.

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C: The BBB is a selectively permeable barrier to many water soluble particles that is incomplete at birth. 

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