Brain FEST : The function of Buffer in Human

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Here is the guide for the issue above:

1. The keyword(s) is are...
2. What is the keyword?
3. Which one is the fragment?
4. Which one is the object?
5. What would happen if the fragment is missing/not functioning?
6. So, what is the function of the fragment?
7. Conclusion from your thinking
8. What if...
9. This reminds me of... (self/text)

Your task: Explain the function of buffer in human.
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