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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

Vertebrate skeletal muscle:

is attached to bone by means of ligaments.

may bend but not extend body parts.

may rotate one body part with respect to another.

is found in the walls of blood vessels and intestines.

consists of cells that contain no nuclei.

Summary Introduction

Introduction:

There are three different types of muscle in the body, the cardiac, skeletal, and the smooth muscles. The muscles help in the movement of different body parts. They protect delicate organs from various injuries and provide shape to the body. The skeletal muscles particularly help in the movement of organs. There are 600 skeletal muscles in our body.

Answer

Correct answer:

One body part rotates with respect to another body part.

Explanation

Justification/explanation for the correct answer:

Option (c) states that one part of the body may rotate with respect to another part. The skeletal muscles are attached to the bones from both sides of the muscles. Contraction in one muscle helps in the movement of different body parts. This depends on the point of attachment of the muscle. Hence, option (c) is correct.

Explanation for the incorrect answer:

Option (a) states that skeletal muscles are attached to bones with the help of ligaments. This statement is incorrect because skeletal muscles are attached to the bones with the help of cords of connective tissue known as tendons. So, it incorrect.

Option (b) states that bending of the vertebrate muscles do not extend the body parts. The extension of the body parts depends on the point of attachment of the vertebrate muscles to the bones by the tendons, so it extends the body parts according to the point of attachment. So, it incorrect.

Option (d) states that skeletal muscles are present in the walls of blood vessels and intestines. The smooth muscles are present in the walls of blood vessels, body cavities, and intestines. The skeletal muscle is stiff so it is not present in cavities or walls of blood vessels. So, it incorrect.

Option (e) states that cells of the skeletal muscles do not contain nuclei. This statement is incorrect because the nuclei are present in the cells of the skeletal muscles. It is also controlled by the somatic nervous system of our body so the nuclei must be present as it plays an important role in a cell. So, it incorrect.

Hence, options (a), (c), (d), and (e) are incorrect.

Conclusion

The skeletal muscles of our body are connected by tendons to different bones. The skeletal muscles help in the movement our body parts such as eyeballs, legs, hands, and so on. The movement of one body part may rotate another body part, depending upon the point of attachment of the muscle.

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