Propagation of an Action Potential
Clicker Questions
Prepared by
Nora Hebert
Red Rocks Community College
Copyright © 2010 Pearson Education, Inc.
Copyright © 2010 Pearson Education, Inc.
The influx of sodium ions in one segment of an
unmyelinated axon initiates which of the following
events?
a.
an action potential in that segment
b.
a depolarizing current that brings the
adjacent segment to threshold
c.
a repolarizing current that brings the
adjacent segment to threshold
d.
all of the above
e.
a and b
Copyright © 2010 Pearson Education, Inc.
The influx of sodium ions in one segment of an
unmyelinated axon initiates which of the following
events?
a.
an action potential in that segment
b.
a depolarizing current that brings the
adjacent segment to threshold
c.
a repolarizing current that brings the
adjacent segment to threshold
d.
all of the above
e.
a and b
Copyright © 2010 Pearson Education, Inc.
Copyright © 2010 Pearson Education, Inc.
The lighting effect, indicated by an arrow, in the
previous slide denotes ________.
a.
an action potential
b.
a depolarizing current
c.
the refractory period
Copyright © 2010 Pearson Education, Inc.
The lighting effect, indicated by an arrow, in the
previous slide denotes ________.
a.
an action potential
b.
a depolarizing current
c.
the refractory period
Copyright © 2010 Pearson Education, Inc.
Copyright © 2010 Pearson Education, Inc.
The refractory period occurs when ________.
a.
voltage-gated sodium channels are open
and potassium channels are closed
b.
voltage-gated sodium channels are
inactivated and potassium channels
are open
Copyright © 2010 Pearson Education, Inc.
The refractory period occurs when ________.
a.
voltage-gated sodium channels are open
and potassium channels are closed
b.
voltage-gated sodium channels are
inactivated and potassium channels
are open
Copyright © 2010 Pearson Education, Inc.
Copyright © 2010 Pearson Education, Inc.
Action potential propagation in myelinated axons is
known as ________.
a.
continuous conduction
b.
gradual conduction
c.
constant conduction
d.
spontaneous conduction
e.
saltatory conduction
Copyright © 2010 Pearson Education, Inc.
Action potential propagation in myelinated axons is
known as ________.
a.
continuous conduction
b.
gradual conduction
c.
constant conduction
d.
spontaneous conduction
e.
saltatory conduction
Copyright © 2010 Pearson Education, Inc.
Copyright © 2010 Pearson Education, Inc.
In myelinated axons, action potential occurs
________ and they propagate ________.
a.
in myelinated segments; slowly
b.
in myelinated segments; rapidly
c.
at nodes of Ranvier; slowly
d.
at nodes of Ranvier; rapidly
e.
in myelinated and unmyelinated segments; rapidly
Copyright © 2010 Pearson Education, Inc.
In myelinated axons, action potential occurs
________ and they propagate ________.
a.
in myelinated segments; slowly
b.
in myelinated segments; rapidly
c.
at nodes of Ranvier; slowly
d.
at nodes of Ranvier; rapidly
e.
in myelinated and unmyelinated segments; rapidly
Copyright © 2010 Pearson Education, Inc.