Question

In vertebrates, the speed of transmission along neurons is much faster in myelinated neurons compared to unmyelinated neurons.

Which of the following is not true of transmission along myelinated neurons?

A. sodium and potassium channels are concentrated at nodes of Ranvier
B. saltatory conduction in non-myelinated neurons slows the process of transmission
C. action potentials are generated only in the nodes of Ranvier

Answer 1

B. saltatory conduction in non-myelinated neurons slows the process of transmission

Step-by-step explanation:

Saltatory conduction in myelinated neurons is faster because the action potential jumps from one node of Ranvier to the next. Sodium and potassium channels are concentrated at the nodes of Ranvier, where action potentials are generated.

Propagation along an unmyelinated axon is referred to as continuous conduction, while propagation along a myelinated axon is referred to as saltatory conduction. Saltatory conduction is faster because the action potential jumps from one node of Ranvier to the next. In myelinated neurons, sodium and potassium channels are concentrated at the nodes of Ranvier, and action potentials are generated at these nodes.

Answer 2

B. saltatory conduction in non-myelinated neurons slows the process of transmission

Explanation:

The action potential flows down the axon as it depolarizes and repolarizes the axon membrane.... Ranvier nodes are openings in the myelin along the axons; they contain channels of sodium and potassium ion, allowing the action potential to rapidly travel down the axon by moving from one node to the next.