Microscopic Anatomy and Contraction of Skeletal Muscle

Microscopic Anatomy and Contraction of Skeletal Muscle

 

Microscopic Anatomy and Contraction of Skeletal Muscle We have already examined the structure of skeletal muscle as seen with the light microscope. As you know, skeletal muscle tissue has alternating light and dark bands, giving it a striated appearance. The electron microscope shows that these bands are due to the arrangement of myofilaments in a muscle fiber.Muscle FiberA muscle fiber contains the usual cellular components, but special names have been assigned to some of these components (Table 7.1 and Figure 7.3). The plasma membrane is called the sarcolemma; the cytoplasm is the sarcoplasm; and the endoplasmic reticulum is the sarcoplasmic reticulum. A muscle fiber also has some unique anatomical characteristics. One feature is its T (for transverse) system; the sarcolemma forms T (transverse) tubules that penetrate, or dip down, into the cell so that they come into contact-but do not fuse-with expanded portions of the sarcoplasmic reticulum. The expanded portions...
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