There are ____ neurons in the human brain. Each neuron may connect with around ____ other neurons. If each neuron connected with every single other neuron, our brain would be ____ in diameter. This is the length of ____. This leads to an important conclusion—namely, that neurons only connect with a small subset of other neurons. Neurons may tend to communicate only with their ____, and ____ connections are the exception rather than the rule. The idea that we only use ____ of the cells in our brain is generally considered a myth. It used to be thought that only around 10 percent of the cells in the brain were neurons (the rest being cells called glia), hence a plausible origin for the myth. This “fact” also turns out to be inaccurate, with the true ratio of neurons to ____ being closer to 1:1. Glia serve a number of essential support functions; for example, they are involved in tissue repair and in the formation of ____. The brain makes up only ____ of body weight. It is no longer believed that neurons in the brain are incapable of being ____. Fortunatelly, they do regenerate.
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Facts about the human brain, part 1
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