Muscle Diversity

Smooth muscle lack sarcomeres and troponin and have 5

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Unformatted text preview: into the SR with every contracGon (saving ATP) AFM contracGons are terminated over Gme by low rates of Ca2+ ATPase acGvity. Vertebrate smooth muscle Smooth muscle – Involuntary , Non ­Striated Found lining the blood vessels, GI tract, respiratory tract, urinary tract, etc in vertebrates. Smooth muscle lack sarcomeres and troponin and have ~5 times the relaGve number of acGn filaments than striated muscle. AcGn and myosin filaments are organized into diagonal bundles around the periphery of the cell. When smooth muscle contracts, the peripheral filaments slide along each other myocytes turn from spindle shaped to globular. The ATPase acGvity of smooth muscle is slower than that of SO fibers. Vertebrate smooth muscle Smooth muscle someGmes has gap juncGon...
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