Answer
7.
When cervical vertebrae are broken, they can no longer support the head.
Work Step by Step
In such a case moving the head forward or backward will stretch and injure the spinal cord.
Human Biology, 14 Edition
by Mader, Sylvia; Windelspecht, Michael
Published by
McGraw-Hill Education
ISBN 10:
1-25924-574-8
ISBN 13:
978-1-25924-574-9
Chapter 12 - Engage - Page 259: 7
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