the nervous system is comprised of the central nervous system (CNS) which is the brain and spinal cord. the peripheral nervous system is neuronal tissues outside the CNS (body not including brain and spinal cord). peripheral is then seperated into autonomic nervous system (ANS) which are involuntary actions such as heartrate, digestion, breathing and respiration rate. somatic which is the voluntary actions like skeletal muscle control, smell, sound, taste and touch. the autonomic nervous system then breaks into sympathetic nervous system (SNS) and parasympathtic nervous system (PNS). SNS is our fight or flight response/emergency response and the PNS is rest and digest and restores homeostasis. SNS has alpha 1 & 2 and beta 1 & 2, it increases bloodpressure and heartrate, constricts blood vessels, opens up airways, stops bleeding, increases sweating and a lot of other things. it's when we are in a dangerous situation and our body goes into fight or flight. the SNS drugs are adrenergic durgs that mimic the effect of norepinephrine and epinephrine. the PNS is nicotinic and muscarinic, this decreases bloodpressure and heartrate, dialtes blood vessels and calms down the body. the PNS drugs are cholinergic drugs which mimic the effect of acetylcholine.
