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I would say the hypothalamus. But if your talking about alertness that would be the recticular formation. Its a bunch of nerves in the brain connecting the spinal cord cerebrum and cerebellum and it's what keeps us conscious and alert.

There really is no loss of consciousness in nearly all confirmed concussions. The similar thing happens when you take a hard knock to the head.

The brain bends, circuits can break, and the resulting damage puts the brain in danger.

Almost all knowledge that arrives and travels to the cortex is relayed through the thalamus.

It affects pain perception, concentration, and alertness. The hypothalamus, epithalamus, ventral thalamus, and dorsal thalamus are the four sections of the hypothalamus.

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https://brainly.com/question/10236884?referrer=searchResults

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