Our brain is amazing. Sensory neurons take information from our nose, ears, tongue, eyes and skin ____ send it to the brain. This information travels at more ____ 240 km per hour. Motor neurons carry messages ____ our brain to the rest of our body. These messages travel at ____ than 320 km per hour. ____ our brain receives information about a dangerous situation, it ____ sends messages to different parts of our body. Our heart beats faster ____ it can send more oxygen to our muscles and our liver releases sugar into our blood to give us ____ energy. These changes mean that our body is stronger and ____ move faster. Our brain calculates information ____ than the most advanced computer. Scientists think that the ability to respond quickly ____ helped humans survive.

Brain and sensory neurons

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