most confusing and important topic of basic pharmacology. any tips how to remember with all receptor , their agonist, antagonist , at which organ they act.
its constriction in nature or relaxing.
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thankyou
thankyou 
To cut short. CNS is brain and its tail (spinal cord) and ANS is which cannot be controlled (heart, SM, glands, etc), which is divided into Sympathetic and Parasympathetic.
