Locus coeruleus shocks brain into hyperactivity. Stress hormones flood the system.
Norepinephrine speeds up respiration.
Adrenaline turns up heart rate, increases blood pressure.
Cortisol shuts down digestion (and suppresses immune response).
Provides extra sugar to fuel brain and muscles.
Fat cells open up to receive fat—storable energy.
Now you’re ready to flee or fight.