divisions: control automatic and regulatory functions such as heart rate, blood flow, excortion and breathing
- They work in opposition to each other:
- - Sympathetic. Tends to speed your up, or promote energy expenditure; is activated by exercise, stress, powerful emotions; symp. activation also causes adrenal glands to release adrenalin; effects of "synpathoadrenal activation" include increased heart rate, increased blood pressure and blood flow to large muscles of arms and legs, dry mouth, rapid shallow breathing. this is part of the "flight or fight"
- - Parasympathetic. Tends to conserve energy, promote digestion, secretion (i.e. saliva or stomach acids), and excretion, reduce heart rate and rate of breathing