Neurons of the Sympathetic nervous system
Neurons of the sympathetic nervous system blank 1 (increase/decrease) heart rate, and neurons of the parasympathetic nervous system blank 2 (slow it down/make is faster). In general, the blank 3 nervous system takes care of “rest- and-digest” activities, and the blank 4 nervous system helps support exercise or emergency actions-the so-called “fight-or-flight” responses.
