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 statements best describes saltatory conduction?

a. It inhibits direct neurotransmitter release.

b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons.

c. It increases neurotransmitter release at the presynapticmembrane.

d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels.

e. It removes neurotransmitters from the synaptic cleft.

Summary Introduction

Introduction:

An action potential generated in a neuron travels from its initiation point on the axon to the axon terminal and then propagates to another neuron. This way, the information travels from one neuron to another. This propagation of action potential is known as conduction. This is of two types: continuous and saltatory.

Explanation

Explanation/Justification for the correct answer:

Option (b) states that the salutatory conduction transmits the action potential at the nodes of Ranvier and speeds up the transmission of the impulse. The propagation of an action potential that takes place by the leaps between spaces on the nodes of Ranvier in a neuron is called saltatory conduction. This occurs in myelinated axons. Voltage-gated channels are present only on nodes of Ranvier, where the current is carried by the sodium ions and the potassium ions. Thus, conduction occurs by jumping. This type of conduction is rapid and travels a longer distance than continuous conduction in a few milliseconds. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) states that saltatory conduction inhibits the direct release of the neurotransmitter. This statement is false because the saltatory conduction does not interfere with the release of the neurotransmitter into the synapse; it only speeds up the transmission of the impulse by making it jump from one node to another...

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

In the following diagram, designate each daughter cell as diploid (2n) or haploid (n).

Human Heredity: Principles and Issues (MindTap Course List)

Fat breakdown without carbohydrate causes ketones to build up in the tissues and blood and be excreted in the u...

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

Why can’t a white dwarf contract as it cools? What is its fate?

Horizons: Exploring the Universe (MindTap Course List)

(a) Estimate the force with which a karate master strikes a board, assuming the hands speed at the moment of im...

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