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. A typical three-cushion sofa is 84 inches wide -- the width is measured between the outer edges of the arms -- by 35 inches deep. A love seat with two cushions is usually 60 inches wide by 35 inches deep. The normal height for both pieces is 37 inches from the floor to the top of the back seat cushion. Because no set standards exist for furniture size, these dimensions may vary by as much as 2 inches within the typical range.