We could not breathe, play, love, or remember without the brain. Together, this complex network of cells gives rise to every aspect of our shared humanity. Different types of glial cells provide physical protection to neurons and help keep them, and the brain, healthy. Neurons are notable for their branch-like projections called axons and dendrites, which gather and transmit electrochemical signals. ![]() Weighing in at three pounds, on average, this spongy mass of fat and protein is made up of two overarching types of cells-called glia and neurons-and it contains many billions of each. ![]() Here’s something to wrap your mind around: The human brain is more complex than any other known structure in the universe.
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