This unit mainly covers the skeletal muscular system. Smooth and cardiac muscle will be discussed in detail with respect to their appropriate systems. The contraction of cardiac muscle is involuntary, strong, and rhythmical. Other muscles, like the skeletal muscle that moves the arm, is controlled by the somatic or voluntary nervous system. There are different types of muscle, and some are controlled automatically by the autonomic nervous system. The cardiac muscle cell is rectangular in shape. Muscles are groups of cells in the body that have the ability to contract and relax.
The cardiac muscle cell has one central nucleus, like smooth muscle, but it also is striated, like skeletal muscle. Cardiac MuscleĬardiac muscle, found in the walls of the heart, is also under control of the autonomic nervous system. Smooth muscle contracts slowly and rhythmically. The non-striated (smooth) muscle cell is spindle-shaped and has one central nucleus. Smooth muscle cannot be controlled consciously and thus acts involuntarily. Smooth muscle, found in the walls of the hollow internal organs such as blood vessels, the gastrointestinal tract, bladder, and uterus, is under control of the autonomic nervous system.
Does essential anatomy 3 have muscle actions skin#
Smooth muscle: Smooth muscle makes up your organs, blood vessels, digestive tract, skin and other areas. That means they work without you having to think about it. They’re involuntary muscles that your autonomic nervous system controls. They help your heart pump blood throughout your body. These muscle fibers are striated (having transverse streaks) and each acts independently of neighboring muscle fibers. Cardiac muscle: Cardiac muscles are only in your heart. The basic unit is the muscle fiber with many nuclei. Thus, these muscles are under conscious, or voluntary, control. The peripheral portion of the central nervous system ( CNS) controls the skeletal muscles. Skeletal muscle, attached to bones, is responsible for skeletal movements. In the body, there are three types of muscle: skeletal (striated), smooth, and cardiac.
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