A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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The greater the number of _________ involved in a motor unit, the ________ the degree of fine muscle control. Question 9 options: a) muscle fibers............less b) ligand gated channels………….less c) layers of epimysium.........less d) muscle fibers............greater

What would happen without input from gamma motor neurons? A) Information about velocity would continue, but information about length would no longer be possible. B) The spindles would be unable to provide feedback as the muscle contracted. C) Neither the intrafusal nor extrafusal fibers would contract. D) The extrafusal fibers would not contract, but the intrafusal fibers would continue to contract.

To demonstrate muscle fatigue, a student held an 8 lb dumbbell in her hand and abducted her arm parallel to the floor. After 45 seconds, she has having difficulty holding that position so she rotated her hand 90 degrees. This allowed her to hold the dumbbell in position for an additional 20 seconds. Which of the following is the best explanation for this? A. Different motor units were contracting while others were relaxing. B. Muscles began to contract isotonically rather than isometrically. C. The load was reduced. D. The resistance to contraction was reduced. E. The change in position provided a greater range of motion at the shoulder.

Answer 2

Question

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Answer 3

Question

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Answer 4

Question

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Answer 5

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

Answer 6

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

Answer 7

Chapter 9, Problem 3RC

Summary Introduction

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

Answer 8

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Answer 9

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Answer 11

Ch. 9 - 1. Active sites on actin become available for...Ch. 9 - Prob. 2RFT Ch. 9 - Prob. 3RFT Ch. 9 - 4. Another name for a muscle that is a prime mover...Ch. 9 - Prob. 5RFT Ch. 9 - Prob. 6RFT Ch. 9 - 7. The theory that explains muscle contraction is...Ch. 9 - Prob. 8RFT Ch. 9 - Label the illustrations to the right as...Ch. 9 - Prob. 1RC

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

Solution Summary: The author explains that the ratio of motor neurons to muscle fibers is highest in muscles that control the eye.

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Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Chapter 9 Solutions

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

Solution Summary: The author explains that the ratio of motor neurons to muscle fibers is highest in muscles that control the eye.

Concept explainers

Videos

Introduction: A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.

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Chapter 9 Solutions

Introduction:

A motor unit denotes the single motor neuron. All the muscle fibers present in the muscles are controlled by the motor neuron. The reduction in the size of the motor unit results in the finer control of the movement.