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5Chapter
5
The Muscular The Muscular
Sy Systemmets
Muscle
is the only human tissue capable of shortening, or
contracting. This unique ability is what makes body movements
possible.
Without muscle the powerful movements required in athletic
performances would be impossible, as would the fi nely tuned,
graceful movements needed to send a text message or play a
musical instrument. Muscles also control the movements of our
eyes, the movement of food through our digestive systems, and the
beating of our hearts.
What enables muscle to be so versatile? In this chapter we will
look at the different types, properties, and structures of muscle,
and examine the effects of different kinds of physical training on
skeletal muscle. We will also discuss some of the common injuries
and disorders of muscles, how these problems tend to occur, and
how their likelihood, in some cases, can be reduced.
Chapter 5
Lessons
Lesson 5.1
Muscle Tissue
Categories and
Functions
Lesson 5.2
Skeletal Muscle
Actions
Lesson 5.3
The Major Skeletal
Muscles
Lesson 5.4
Common Injuries
and Disorders of
Muscles