Question

Please describe the functional pathway of the nervous system in terms of the following example. You are about to cross the street and see a car coming right for you. Describe the pathways of the nervous system involved in this reaction (7) and include a brief description of each (7). (Hint *: start with receptors).

Answer 1

Answer A-Sympathetic system is involved in this reaction. b)pathways-the sympathetic nervous system operates through a series of interconnected neurons.It is the part of the PNS,although there are many that lie within the central nervous system .Sympathetic neurons of the spinal cord communicates with peripheral sympathetic neurons via a series of sympathetic ganglia.within the ganglia ,spinal cord sympathetic neurons join peripheral sympathetic neurons through chemical synapses.At synapses within the sympathetic ganglia ,preganglionic sympathetic neurons release acetylcholine,that binds and activates nicotinic acetylcholine receptors on postganglionic neurons.In response to the stimulus postganglionic neurons principally release noradrenaline.prolonged activation can elicit the release of adrenaline from the adrenal medulla.Once released noradrenaline and adrenaline bind adrenergic receptors on peripheral tissues .Binding to adrenergic receptors causes the effects seen during fight or flight response.