Sketch a diagram or a flow chart to explain how does the autonomic nervous system exert its effects on its target tissue and organs. Give a specific example to illustrate your response.
Sympathetic nervous system originate from thoracolumbar outflow ( Throacic anf lumbar spinal cord ) and parasympathetic nervous system from cranial nerve 3,7,9,10 and sacral (S2,3,4) spinal cord craniosacral outflow.
Eg : 1)Heart : parasympathetic system have inhibitory action and
cause decrease heart rate and decreased conduction .Heart have M2
receptors Acetycholine acts on M2 receptors and exert its
action
Sympathetic system - Stimulate the heart by stimulating beta 1
receptor on heart and Neurotransmitter is Adrenaline
Eyes : Parasympathetic system stimulates sphincter pupillae (M3
receptors ) and result in miosis
Sympathetic system stimulates the dilator pupillae through alpa 2
receptor on dilator pupillae and cause mydriasis .
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