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question/answers for nervous system

by: ayesha

question/answers for nervous system Bio 2110k

Marketplace > Georgia State University > Biology > Bio 2110k > question answers for nervous system
Human anatomy & physiology

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About this Document

here is an overview (questions and answers) for topics related to the nervous system
Human anatomy & physiology
75 ?




Popular in Human anatomy & physiology

Popular in Biology

This 0 page Bundle was uploaded by ayesha on Tuesday December 8, 2015. The Bundle belongs to Bio 2110k at Georgia State University taught by in Spring 2014. Since its upload, it has received 36 views. For similar materials see Human anatomy & physiology in Biology at Georgia State University.


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Date Created: 12/08/15
What is an action potential How are ions cations and anions distributed inside and outside the cell What is resting membrane potential Why is it important What sets resting membrane potential Occurs when graded potentials reach threshold Potassium higher inside the cell Sodium higher outside the cell Resting membrane potential both K and Na in and out are the same and there is no difference in permeability because the gates are closed There is an equilibrium What are the phases of an action potential Resting state gt threshold gt depolarization gt repolarization gt hyperpolarization gt back to resting stage What are the differences between the two types of refractory periods Two types of refractory periods Absolute refractory period basically nothing happens Insensitive to other stimulus No matter how large the stimulus might be no other action potential will be produced Relative refractory period exceptionally strong stimulus MAY generate action potential Happens while repolarization is still occurring Proceeded by absolute refractory period How does a graded potential differ from an action potential Graded potentials can be summated Unlike action potentials they are not a all or nothing event Magnitude varies depending on the large or small stimulus Differentiate between absolute and relative refractory periods Where does each occur and what is the significance of each one Absolute refractory period basically nothing happens Happens after an action potential is generated and lasts until repolarization Insensitive to other stimulus No matter how large the stimulus might be no other action potential will be produced Relative refractory period exceptionally strong stimulus MAY generate action potential Happens while repolarization is still occurring Proceeded by absolute refractory period Explain how the CNS tells the difference between a weak stimulus and a strong one strong stimulus can produce action potentials more often than the week stimulus CNS determines intensity of impulses by the frequency of the impulses How are action potentials propagated What effect does myelination and axon diameter have on action potential propagation AP propagate in one direction Produce local currents that cause the membrane to depolarize Mylinnated axons has faster speed of conduction where the lipids act as insulation where currents jump from node to node Larger diameters conduct more rapidly than smaller because they have a larger surface area What is multiple sclerosis What are the symptoms and causes of this disease Multiple sclerosis is an autoimmune disease that affects young adults Symptoms include loss of vision muscular control speech disturbance Hardened lesions Short circuiting of nerve impulses Impulse conduction slows and eventually dies 9 10 11 12 13 What happens at the synapse Differentiate between chemical and electrical synapses and their locations and general functions Synapse is a junction that mediates information transfer from one neuron to another neuron or to an effector cell Types of synapses electrical synapse less common than chemical Joined by jap junctions Rapid communication Uni or b0 directional Chemical synapse specialized for neurotransmitters Composed of axon terminal before the synapse and a receptor after the synapse Describe the events of a typical chemical synapse What are the types of post synaptic potentials Why are they signi cant IPSP inhibitory mem Pot Away from threshold hyperpolarizing EPSP excitatory mem pot towards threshold Depolarizing Describe the different types of ESPS summation Temporal special and combination Describe the three different neuronal pathways and circuits Converging saliva production multiple input one output diverging skeletal muscles single input to many outputs reverberating for sleeping repeated and cyclical stimulation and once activated it can function until its broken and parallel after discharge transmitted along several pathways High order thinking


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