Progressive care units are increasingly common in hospitals in the United States. These units are often used to bridge the gap between intensive care units and medical-surgical units, with the goal of providing cost-effective, high-quality, safe care.
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The transverse tubules (t-tubules) of mammalian cardiac ventricular myocytes are invaginations of the surface membrane that occur at the Z line and have both transverse and longitudinal elements. Many of the proteins involved in excitation-contraction coupling appear to be concentrated at the t-tubules.