Muscle Contraction and Movement
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Questions and Answers

What are the four main functions of muscles in the body?

  1. Purposeful movement of the whole body or parts of the body, 2) Manipulation of external objects, 3) Propulsion of contents through hollow internal organs, 4) Emptying the contents of certain organs to the external environment

What percentage of body weight does skeletal muscle alone make up in men?

40%

Describe the size range of a single skeletal muscle cell, or muscle fiber.

10 to 100 micrometers in diameter and up to 750,000 micrometers in length

How are skeletal muscle fibers classified based on their internal arrangement?

<p>Striated</p> Signup and view all the answers

What is the total weight percentage of smooth and cardiac muscle in the body?

<p>10%</p> Signup and view all the answers

What is the process by which huge skeletal muscle fibers are formed during embryonic development?

<p>The fusion of many smaller cells called myoblasts</p> Signup and view all the answers

What is the main difference between striated and unstriated muscles?

<p>Striated muscles show alternating dark and light bands, while unstriated muscles do not.</p> Signup and view all the answers

Describe the voluntary control aspect of skeletal muscle.

<p>Skeletal muscle is innervated by the somatic nervous system and subject to voluntary control.</p> Signup and view all the answers

What is one of the subconscious, involuntary regulations related to skeletal muscle activity?

<p>Posture, balance, and rhythmic movements like walking.</p> Signup and view all the answers

What is the function of cardiac muscle?

<p>To pump blood throughout the body.</p> Signup and view all the answers

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