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Nervous System: Neuron, Synapse, Reflexes · Zoology

Which of the following describes an Inhibitory Postsynaptic Potential (IPSP)?

  1. A small depolarization that moves the membrane closer to threshold
  2. A hyperpolarization that moves the membrane further from threshold
  3. A permanent block of all future action potentials
  4. The rapid reset of the resting membrane potential
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Correct answer: A hyperpolarization that moves the membrane further from threshold

An IPSP occurs when neurotransmitters cause the opening of $K^{+}$ or $Cl^{-}$ channels. This makes the inside of the postsynaptic cell more negative (hyperpolarized), decreasing the likelihood of an action potential.

Difficulty: Medium Question 5 of 20

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