HTHSCI 1H06 Lecture Notes - Lecture 25: Cholinergic, Adrenergic, Tachycardia
29 Apr 2016
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Document Summary
The branch of your nervous system that controls your involuntary muscles like the heart and smooth muscles. For this reason it is sometimes called the visceral motor nervous system. There is also a sensory part (visceral afferents) of the system but it is largely ignored except in regard to referred pain . The most important role of the ans is to maintain homeostasis of things like blood. Voluntary control and one neuron from cns to effector. Involuntary control (autonomous) and two neurons between the cns and effector. First (preganglionic) and second (postganglionic) neurons connect in areas called autonomic ganglia. Innervates cardiac muscle, smooth muscle and glands. Norepinephrine (ne or noradrenalin) used on effector. Most visceral organs have both types of visceral motor input and effect on the organs is appropriate for the role of: Sympathetic input speeds up heart rate (tachycardia) and increase the force of contractions (ie: positive inotropic effect)
