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Biology: The Dynamic Science (Mind...

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

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

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

Endoskeletons:

a. protect internal organs and provide structures against which the force of muscle contraction can work.

b. differ from exoskeletons in that endoskeletons do not support the external body.

c. cannot be found in echinoderms.

d. are composed of cartilaginous structures that form the skull.

e. compose the arms and legs.

Summary Introduction

Introduction:

Both invertebrates and vertebrates show three major support systems, namely, hydrostatic skeletons, exoskeletons, and endoskeletons. An endoskeleton provides a support system through internal body structures such as bones. In invertebrates, echinoderms have endoskeleton, while in the vertebrates, the endoskeleton is the primary support system among most animals.

Explanation

Justification for the correct answer:

Option (a) states that the endoskeletons protect internal organs and provide structures against which the force of muscle contraction can work. Endoskeleton literally means the support system for internal organs through an internal body support system. Endoskeletons, being present inside the body frame provide protection for delicate internal tissues such as that of brain, lungs, heart, and kidneys through a force of contraction applied against body structures such as bones. Hence, option (a) is a correct statement.

Justification for the incorrect answers:

Option (b) states that the endoskeletons differ from exoskeletons, as endoskeletons do not support the external body. This is a false statement as the main function of an endoskeleton is to provide an overall framework and protection to the body, including the external organs and help in movement. Thus, both exoskeleton and endoskeleton give protection to both internal and external body parts. Hence, it is an incorrect option...

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