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.

Question

Quizplus · Accepted Answer

The reason the areas around the third ventricle can detect chemicals circulating in the blood is that these areas are not protected by a blood-brain barrier. This allows for direct communication between these areas and the bloodstream, making it possible for them to detect changes in blood chemistry.

The Areas Around the Third Ventricle Can Detect Chemicals Circulating