PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They travel down axons.
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They lose strength as they move towards the axon hillock.
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They lose strength as the move towards the terminal endings.
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The speed of the graded potential depends on how much myelin is covering the axons or dendrites.
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A threshold must be established before a graded potential will fire.
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Detailed explanation-1: -Graded potentials lose their strength as they move through the cell due to the leakage of charge across the membrane (eg. leaky water hose). Average extracellular action potential (EAP) of the pyramidal cell model. A graded potential depolarization is called excitatory postsynaptic potential (EPSP).
Detailed explanation-2: -Answer and Explanation: The answer is a. Graded potentials can form on receptor endings in response to different stimuli and be used for sensory perception and motor control. Postsynaptic potentials are graded potentials that originate in the postsynaptic neuron.
Detailed explanation-3: -Graded ion potentials will lose their strength as they move some distance via the cell because of leakage or loss of charge across the cell membrane.
Detailed explanation-4: -Most graded potentials occur in the cell body before the axon hillock.