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.
Countertops in many home stores are sold by the linear foot not a square foot, which is 12 inches by 12 inches. A linear foot is 12 inches wide and 25 inches deep because the standard depth of kitchen countertops is 25 inches. Finally, if your heart is set on granite but your wallet is stuck on laminate, you're in luck. The hottest new laminates are made to look like the much more expensive granite.