part 2 Nervous system - Nervous System What are the...

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1 Nervous System What are the important structures of a typical neuronal cell? Define a resting potential and action potential. What is the importance of each with regard to a nerve impulse. What are the basic structures of the nervous system? What are the pathways of nerve impulses from initiation to muscle action? How do neurons communicate with one another and what is the role of neurotransmitters in this communication? Draw an organizational chart of the nervous system. Include the somatic and autonomic divisions. How do the sympathetic and parasympathetic systems differ? Organization of the Nervous System Basic neuronal cell
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Nerve Impulse A nerve impulse —an electrical charge—is the signal that passes from one neuron to the next and finally to an end organ , such as a group of muscle fibers, or back to the CNS Two important terms to understand are the Resting Membrane Potential (RMP) and Action Potential (AP). But first, what exactly is a membrane “potential”? Membrane potential refers to the difference between the electrical charges inside and outside a cell, caused by separation of charges (ions) across the cell membrane Now that you know what a membrane potential is, it is important to know the difference between a “resting potential” and an “action potential”. What is the “Resting Membrane Potential”? Since this electrical charge (-70mV ) or “potential” is associated with the membrane of a “resting” neuronal cell, it is referred to as the Resting Membrane Potential (RMP) What is an action potential? An action potential involves a change in potential (over the RMP) that is conducted down the neuron as a nerve impulse Before an action potential is generated, the neuronal cell must receive a stimulus that generates enough change in potential to overcome a threshold level. Once threshold is met or exceeded, the all-or-none
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part 2 Nervous system - Nervous System What are the...

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