system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does blood rush to our faces when we are embarrassed or frustrated?

Being a frequent victim of blushing, I'm curious.
gpt
When you're embarrassed, your body releases adrenaline, speeding up your heart rate and dilating your blood vessels to increase your blood flow and oxygen delivery. Your face will turn red because of the blood flow.