PHYSIOLOGY
CENTRAL NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A channel opens on a postsynaptic membrane that causes a negative ion to enter the cell. What type of graded potential is this?
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Depolarizing
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Repolarizing
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Hyperpolarizing
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Non polarizing
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Explanation:
Detailed explanation-1: -The hyperpolarizing graded potential causes a negative ion to enter the cell when a channel opens on a postsynaptic membrane.
Detailed explanation-2: -A graded potential is produced when a ligand opens a ligand-gated channel in the dendrites, allowing ions to enter (or exit) the cell. For example, Na+ will enter the cell and K+ will exit, until they both reach equilibrium.
Detailed explanation-3: -receptor potentials occur in specialized sensory receptor cells (you’ll hear more about these in the Neurological Medicine course) postsynaptic potentials occur in neurons. end plate potentials (EPPs) occur in muscle cells. 12-Nov-2014
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