Practice question · Put in order
Order the sympathetic 'fight-or-flight' response, from threat to recovery.
- Heart rate rises, pupils dilate, and digestion is inhibited.
- Once the threat passes, the parasympathetic branch restores rest-and-digest.
- A threat is perceived and the sympathetic branch activates.
- Adrenaline amplifies and prolongs the body's aroused state.
- The adrenal medulla releases adrenaline into the bloodstream.
Hints
- The nerve signal acts first; the bloodborne hormone amplifies and outlasts it.
- Recovery is the OTHER branch taking over once the danger is gone.
Show the answer
- A threat is perceived and the sympathetic branch activates.
- Heart rate rises, pupils dilate, and digestion is inhibited.
- The adrenal medulla releases adrenaline into the bloodstream.
- Adrenaline amplifies and prolongs the body's aroused state.
- Once the threat passes, the parasympathetic branch restores rest-and-digest.
Why
Sympathetic activation drives the immediate changes, then the adrenal medulla's adrenaline amplifies and prolongs them, and finally the parasympathetic branch restores calm. The hormonal amplification comes after the fast neural response, and recovery is an active parasympathetic step.
Practise Peripheral Nervous System
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