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Biology, 25.07.2019 23:00 geezwell8875

In the middle of the night, you hear two loud thumps outside your bedroom door. your nervous system increases your heart rate and sends blood away from internal organs to your muscles, preparing you for "fight or flight." when you learn it is just your roommate coming in late, your nervous system slows down your heart rate and calms you down.

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In the middle of the night, you hear two loud thumps outside your bedroom door. your nervous system...
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