IB Biology: C2.2-Saltatory Conduction of Nerve Impulses

In myelinated neurons, where do action potentials primarily occur?

• Along the entire length of the myelin sheath.

• Only at the Nodes of Ranvier.

• Within the cell body of the neuron.

• At the dendrites.

What is the primary role of myelin in saltatory conduction?

• To facilitate continuous depolarization along the axon.

• To allow depolarization to occur only at the nodes of Ranvier.

• To increase the movement of ions across the membrane.

• To decrease the speed of impulse transmission.

What is saltatory conduction?

• The continuous flow of action potentials along an unmyelinated axon.

• The jumping of action potentials from one node of Ranvier to the next.

• The process of myelin sheath formation around an axon.

• The depolarization of the entire length of a nerve fiber.