When is an action potential triggered? (Choose 1)     When IPSPs exceeds EPSPs   When EPSPs exceeds IPSPs   When chloride channels open   When potassium channels open

Give examples of graded potential, resting potential and action potential  seen in neurons.

Explain Role of Na+ in the generation of action potential.

What is a typical speed of action potential propagation in the absence of myelination?  (Not the maximum speed, just the typical speed). A) 1 m/min B) 1 m/sec C) 10 m/sec D) 100 m/sec E) 1000 m/sec

Distinguish between insulation by oligodendrocyte or Schwann cells. Relate myelination to signal speed.  Describe the myelin-related terms: neurilemma, nodes of Ranvier, internodes, nonmyelinated

Refer to the graph showing the course of an action potential. Which of the numbered points along the graph represent the time when voltage-gated potassium channels are first activated? a) 1 b) 2 c) 3 d) 4 e) 5

the potassium leak channels were suddenly blocked in a resting neuron, what would happen to its resting membrane potential?

(b) Use Figure Q1(b) of an action potential to answer questions (i) until (iv) below. Choose the correct letter to represent each condition. (i) The neuron cannot fire an action potential because it is in a refractory period. (ii) The membrane potential is about -70 mV. (iii) The voltage-gated Na+ channels activation gates are closed, but the inactivation gates are open. (iv) Both gates of the voltage-gated Na+ channels are open. C Threshold B A E Figure Q1 (b)

Define refractory period, and explain the difference between the absolute refractory period and relative refractory period associated with transmitting an action potential.

Compare and contrast EPSPs, IPSPs, and action potentials Include the following information: Location, size relative to threshold/amplitude, active versus passive, ion channels involved