Muscle Tissue

Muscle tissue is composed of cells that can contract. Every function that muscle tissue performs—from creating a facial expression to keeping the eyes in focus—is carried out by groups of muscle cells that contract in a coordinated fashion. The human body has three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle moves the bones in your trunk, limbs, and face. Smooth muscle handles body functions that you cannot control consciously, such as the movement of food through your digestive system. Cardiac muscle, found in your heart, pumps blood through your body. Figure 45-1a, on the following page, shows an illustration of cells of skeletal muscle tissue.

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