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Yes adrenaline fom the adreanal glands is secreated in to the blood and the heart rate is increased. It is part of the flight or fight response.

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16y ago
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15y ago

it increases because your brain sent a message to your body that means your scared and that agitates your body to the heart beat goes up!

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14y ago

Your adrineline is way up therefore making your heart rate go up

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Q: Why heart beats are increased when you are afraid?
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