How Do Action Potentials in a Myelinated Axon Differ from Action

question 116

Multiple Choice

How do action potentials in a myelinated axon differ from action potentials in an unmyelinated axon?

• A) Action potentials are slower in myelinated axons because the myelin sheath interferes with the transfer of ions across the membrane.
• B) Action potentials jump from node to node in myelinated axons rather than progressing down the entire length of the axon.
• C) Action potentials have greater electrical charges in myelinated axons.
• D) Action potentials in myelinated axons operate according to the all-or-none law, but action potentials in unmyelinated axons do not.

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Definitions:

Prophase

The first stage of cell division in both mitosis and meiosis where chromosomes become visible and the nuclear envelope begins to break down.

Telophase

The final stage of cell division, where the chromatids or chromosomes move to opposite ends of the cell and two nuclei are formed.

Metaphase

A phase of cell division in which the chromosomes are aligned at the spindle equator halfway between the spindle poles.

Mitosis

A process of cell division that results in two genetically identical daughter cells each having the same number of chromosomes as the parent nucleus.