Transverse tubules. - tubules formed by invaginations of the sarcolemma and flanked by the sarcoplasmic reticulum, they carry action potentials deep into the muscle fiber. T tubules and SR provide tightly linked signals for muscle contraction. T tubules at each A band/I band junction-continuous with the sarcolemma.
Standard Sizes of Sofas. Sofas vary in size, from 6 to 8 feet long and 32 to 40 inches deep for a standard size sofa, to 4 to 6 feet long and 28 to 30 inches deep for a loveseat.The actual depth of the seating area is reduced by the depth of the sofa's arms and back of the sofa.ofas vary in size, from 6 to 8 feet long and 32 to 40 inches deep for a standard size sofa, to 4 to 6 feet long and 28 to 30 inches deep for a loveseat.
Here are the standard table and couch dimensions: 1  Three-seat sofa: 35 inches deep by 84 inches wide. 2  Loveseat: 35 inches deep by 60 inches wide. 3  Armchair: 35 inches wide by 35 inches deep.  Coffee Table: 30 inches wide by 48 inches 1  long. Square end table: 24 inches wide by 24 inches long.  Rectangular end table: 24 inches wide by 28 inches long.