The Areas Around the Third Ventricle Can Detect Chemicals Circulating

Multiple Choice

The areas around the third ventricle can detect chemicals circulating in the blood because:

A) these areas are not protected by a blood-brain barrier.
B) these areas have low concentrations of solutes themselves.
C) there is so much more blood here than anywhere else in the brain.
D) these cells maintain a higher internal temperature than the rest of the body.