BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Which of the following does not contribute to propagation of action potentials?

a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane.

b. The refractory period allows the impulse to travel in only one direction.

c. Each segment of the axon prevents the adjacent segments from firing.

d. The magnitude of the action potential stays the same as it travels down the axon.

e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.

Summary Introduction

Introduction:

A response that is observed as a temporary reversal in the membrane potential of a muscle fiber is called action potential. It occurs when a stimulus from the motor neuron is received. After the initiation of an action potential in the neuron, its propagation takes place along the surface of the axon. This occurs as a wave of depolarization, which travels away from the point of stimulation.

Explanation

Explanation/justification for the correct answer:

Option (c) states that each segment of the axon prevents the adjacent segments of the neuron from firing. However, each segment of the axon stimulates the adjacent segments to fire so that the action impulse can move more rapidly as a nerve impulse. Hence, the option (c) is correct.

Explanation for incorrect answers:

Option (a) states that the area outside the membrane becomes negative and it attracts ions from adjacent regions, as the inside becomes more positive, it attracts negative ions from the nearby cytoplasm helping in the depolarization. This option is incorrect because it contributes toward the propagation of the nerve impulse. It causes depolarization of the membrane of the axon, which is important for downstream propagation of the impulse. Thus, contributing to its conduction. So, it is an incorrect option.

Option (b) states that the refractory period allows the impulse to travel in one direction...

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Science Solutions

Find more solutions based on key concepts

Show solutions add

Label the hearts main parts in the diagram below.

Human Biology (MindTap Course List)

Both carbohydrates and protein have 4 calories per gram. T F

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

3.10 Define the term stoichiometric coefficient.

Chemistry for Engineering Students

22-98 How are the cyclic structures of oxytocin and vasopressin formed?

Introduction to General, Organic and Biochemistry

A thin rod of mass 0.630 kg and length 1.24 m is at rest, hanging vertically from a strong, fixed hinge at its ...

Physics for Scientists and Engineers, Technology Update (No access codes included)