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@ THE MUSCULAR SYSTEM Muscles, the specialized tissues that facilitate body movement, make up about 40% of body weight. Most body muscle is the voluntary type, called skeletal muscle because it is attached to the bony sk eleton. Skeletal muscle contributes to body contours and shape, and it composes the organ system called the mus- cular system. These muscles allow you to grin, frown, run, swim, shake hands, swing a hammer, and to otherwise manipulate your environment. The balance of body muscle consists of smooth and cardiac muscles, which form the bulk of the walls of hollow organs and the heart. Smooth and cardiac muscles are involved in the transport of materials within the body. Study activities in this chapter deal with microscopic and gross structure of muscle, identification of voluntary muscles, body movements, and important understandings of muscle physiology. OVERVIEW OF MUSCLE TISSUES 1. Nine characteristics of muscle tissue are listed below and on page 104. Identify the muscle tissue type described by choosing the correct response(s) from the key choices. Enter the appropriate term(s) or letter(s) of the key choice in the answer blank. Key Choices A. Cardiac, B. Smooth C. Skeletal y CAMNac A {Sim oo}\)\ — 1. Involuntary . Carcwac Ng 2. Banded appearance % Ww rb 3, Longitudinally and circularly arranged layers Cs {On 4. Dense connective tissue packaging Yori. 5. Figure cight packaging of the cells A (cu 6. Coordinated activity to act as a pump 103