|Catalog >> Medical Science >> Body Parts|
Made up of 30 billion nerve cells (neurons).
The brain, weighing an average of 2-3 lbs, is made up of 30 billion nerve cells (neurons). Breathing, circulation, and sleeping are controlled from the base of the brain near the spinal cord. Due to their many convoluted folds, the two hemispheres make up 70% of the brain and nervous system. SIZE: 1"x1"
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