When you're stressed - whether it's an exam, a spider,...
Psychology265 views·Updated 1 Sept 2026·1 pageUnderstanding Fight or Flight Response in Biopsychology
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The Fight or Flight Response
Your body's stress response is like having a built-in alarm system that works faster than you can think. When your hypothalamus spots trouble, it immediately kicks two major systems into gear: your sympathetic nervous system and your endocrine system.
Here's the lightning-fast chain reaction: your pituitary gland releases ACTH, which signals your adrenal glands to pump out cortisol and adrenaline. Think of adrenaline as your body's natural energy drink - but way more powerful.
Adrenaline gets released from the adrenal medulla and transforms your body in seconds. Your heart pounds faster, you breathe quicker, and your blood pressure shoots up. Blood gets redirected away from your skin, kidneys, and digestive system straight to your muscles and brain where you need it most.
Quick Fact: You might start sweating and feel your stomach "drop" because your body is literally shifting resources to help you think clearly and move fast - perfect for escaping danger or facing it head-on.
After the threat passes, your parasympathetic division takes over like a gentle brake, bringing everything back to normal resting state. This whole process shows how brilliantly your endocrine and autonomic nervous systems work together to keep you safe.
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Psychology265 views·Updated 1 Sept 2026·1 pageUnderstanding Fight or Flight Response in Biopsychology
J
Jane@jane_dggm
When you're stressed - whether it's an exam, a spider, or a loud noise - your body launches into an incredible survival mode called the fight or flight response. This automatic reaction has kept humans alive for thousands of years...
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The Fight or Flight Response
Your body's stress response is like having a built-in alarm system that works faster than you can think. When your hypothalamus spots trouble, it immediately kicks two major systems into gear: your sympathetic nervous system and your endocrine system.
Here's the lightning-fast chain reaction: your pituitary gland releases ACTH, which signals your adrenal glands to pump out cortisol and adrenaline. Think of adrenaline as your body's natural energy drink - but way more powerful.
Adrenaline gets released from the adrenal medulla and transforms your body in seconds. Your heart pounds faster, you breathe quicker, and your blood pressure shoots up. Blood gets redirected away from your skin, kidneys, and digestive system straight to your muscles and brain where you need it most.
Quick Fact: You might start sweating and feel your stomach "drop" because your body is literally shifting resources to help you think clearly and move fast - perfect for escaping danger or facing it head-on.
After the threat passes, your parasympathetic division takes over like a gentle brake, bringing everything back to normal resting state. This whole process shows how brilliantly your endocrine and autonomic nervous systems work together to keep you safe.
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