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.
Save. The length of a sofa is as critical an element as the color, style and material. A living room sofa to seat three people is typically about 84 inches long, but that can stretch to 90 inches or more in a large enough room.Sofas come in all shapes and sizes, including measurements for loveseats, sleeper sofas and sectionals. living room sofa to seat three people is typically about 84 inches long, but that can stretch to 90 inches or more in a large enough room. Sofas come in all shapes and sizes, including measurements for loveseats, sleeper sofas and sectionals.