Although the midbrain occupies only one-fifth of the volume of the brain, its influence on behavior is extensive, which is why it is also known as the emotional brain. The midbrain is sometimes called the chemical brain as well, because it is responsible for regulating many different internal states. It is our midbrain that performs all those marvels that we usually take for granted, automatically maintaining and controlling body temperature, blood sugar levels, blood pressure, digestion, hormone levels, and innumerable other processes. The midbrain also adjusts and maintains our internal
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