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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Most human axons have a myelin sheath that ___ .

  1. a. prevents action potentials from moving backward
  2. b. increases the speed of action potential conduction
  3. c. consists of specialized interneurons
  4. d. increases the size of action potentials

Summary Introduction

Introduction: Neurons are brain cells that are specialized to transmit nerve impulses. The action potential travels away from the cell body and toward the axon terminals. Most of the vertebrate axons are covered by myelin sheath that insulates them and speeds the conduction of axon potentials.

Explanation

Reasons for the correct statement:

The speed of the action potential depends on whether it is insulated or not. Myelin sheath insulates the vertebrate axons; it covers around axons one after another. The myelin sheath prevents the leakage of action potential and increases the speed of action potential.

Hence, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “prevents action potentials from moving backward”. But, the refractory period prevents the action potential from moving backward...

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