BIO SCI E109 Chapter Notes - Chapter 11: Myoglobin, Cardiac Muscle, Sarcolemma
8 Oct 2016
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Document Summary
Tendon: a cord of connective tissue that attaches the muscle to a bone. Individual muscle fiber, fascicles, and skeletal muscles are all surrounded by a sheath of connective tissue: the components of a skeletal muscle fiber allow contraction to occur. During embryonic development, many myoblast fuse to form one skeletal muscle fiber(mature skeletal muscle fiber has multiple nuclei). Some myoblast persist in mature skeletal muscle as satellite cells(retain the capacity to fuse with one another or with damaged muscle fibers to regenerate functional muscle fibers, but not enough). Sr=sarcoplasmic encircles reticulum: each myofibril, similar in to the nonmuscular cells. A triad is a transverse tubule and the two terminal cisternae of the sarcoplasmic reticulum on either side of it. : tiny invagination of the sarcolemma, tunnel in from the surface toward the center of each muscle fiber. Muscle action potentials travel along the sarcolemma & through t tubules, quickly spreading throughout the muscle fiber.
