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Prepares the body for 'fight or flight': increases heart rate, dilates airways, releases adrenaline, and inhibits digestion.

Promotes 'rest and digest': slows heart rate, contracts the bladder, stimulates digestion, and conserves energy.

Controls gastrointestinal system: regulates gut movements and secretions for proper digestion.

Releases adrenaline and noradrenaline into bloodstream, augmenting the 'fight or flight' response.

Regulates blood vessel diameter, affecting blood pressure and flow.

Influences heart rate and strength of heart contractions, modulating blood pressure and heart function.

Regulates the rate and depth of breathing, integrating with the rest of the autonomic nervous system.

Constricts pupil in response to bright light to protect the retina and improve visual acuity.

Adjusts heart rate and blood vessel diameter in response to changes in blood pressure.

Activates sweating and peripheral vasodilation, facilitating heat loss.

Triggers release of glucose for immediate energy, increases oxygen availability, and directs blood to essential organs.