Explanation The muscles of the limb or skeletal muscles are voluntary muscles. These muscles are moved only when the motor impulse from the brain reaches the muscles and produces action by contracting muscles to achieve the task. This impulse reaches the limbs via the spinal cord. So, when there is an injury to the neck region, the spinal cord is compressed and the motor impulse cannot be forwarded to the muscles. Hence, the limb muscles are paralyzed. Opposed to the skeletal muscles, the heart is made up of cardiac muscles. These muscles are different than other muscles like they are interconnected for better impulse movement through the heart...

Human Biology: Concepts and Current Issues

7th Edition

ISBN: 9780321821652

Author: Michael D. Johnson

Publisher: Benjamin Cummings

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Question

Chapter 6, Problem 7CR

Summary Introduction

To review:

The rationale behind paralysis of skeletal muscles of the limb by spinal cord injury to the neck, while no effect of the injury to the cardiac muscles is not affected as the heart beats rhythmically.

Introduction:

Spinal cord injuries are irreparable as the nerve cells do not have the ability to regenerate. When there is a minor injury to the spinal cord at the neck region, the damage to the body could be manageable, but if the damage is extensive then all the limbs below neck region are paralyzed. In both cases, the cardiac muscles are not affected.

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Chapter 6, Problem 6CR

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Chapter 6 Solutions

Human Biology: Concepts and Current Issues

Ch. 6 - 1. Do you think we should continue to try to...Ch. 6 - Prob. 2QC Ch. 6 - Describe how muscle contraction can resist...Ch. 6 - Describe how a muscle's origin and insertion...Ch. 6 - Describe the roles of calcium in muscle...Ch. 6 - 4. Explain what causes rigor mortis. Ch. 6 - Prob. 5CR Ch. 6 - Prob. 6CR Ch. 6 - Prob. 7CR Ch. 6 - 8. Compare and contrast how a constant degree of...

Ch. 6 - Prob. 9CR Ch. 6 - Prob. 10CR Ch. 6 - Prob. 1TY Ch. 6 - 2. Which of the following choices arranges the...Ch. 6 - All of the following are functions of the muscular...Ch. 6 - 4. Which of the following happens during muscle...Ch. 6 - 5. Botulism toxin inhibits the release of...Ch. 6 - The sliding filament mechanism describes the...Ch. 6 - 7. What is the first and most direct energy...Ch. 6 - As you clasp your hands in front of you and push...Ch. 6 - 9. All of the following may happen in response to...Ch. 6 - Which of the following is/are characteristic of...Ch. 6 - Which of the following is the site of calcium ion...Ch. 6 - What is the role of ATP in muscle function? a. ATP...Ch. 6 - 13. Which of the following would have motor units...Ch. 6 - Which type(s) of muscle cells can contract the...Ch. 6 - Prob. 15TY Ch. 6 - Why do you think it is generally accepted medical...Ch. 6 - Prob. 2AWK Ch. 6 - What would happen to a muscle if one of its...Ch. 6 - Prob. 4AWK Ch. 6 - Prob. 5AWK Ch. 6 - Prob. 6AWK Ch. 6 - Prob. 7AWK

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Solution Summary: The author explains the rationale behind paralysis of skeletal muscles of the limb by spinal cord injury to the neck, while the heart beats rhythmically.

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