70. Smooth muscle fibres do not have(1) Z-lines, and in place, they ha

1.	70. Smooth muscle fibres do not have(1) Z-lines, and in place, they have dense bodies(2) Myofibrils and Sarcomeres(3) Syncytial cell(4) All
Answer» the correct option is (b) they do not have striations and sarcomeres, smooth muscle fibers do have actin and myosin contractile proteins, and thick and thin filaments. These thin filaments are anchored by dense bodies. Adense bodyis analogous to the Z-discs of skeletal and cardiac muscle fibers and is fastened to the sarcolemma. Single-unitsmooth muscleis usually made up ofcellsthatarecoupled by gap junctions, allowing ions and action potentials to pass between adjacentcells. This arrangement allows the entire sheet ofsmooth muscleto function as a unit, or asyncytium, and is characteristic of GIsmooth muscle.

70. Smooth muscle fibres do not have(1) Z-lines, and in place, they have dense bodies(2) Myofibrils and Sarcomeres(3) Syncytial cell(4) All

Answer»

the correct option is (b)

they do not have striations and sarcomeres, smooth muscle fibers do have actin and myosin contractile proteins, and thick and thin filaments. These thin filaments are anchored by dense bodies. Adense bodyis analogous to the Z-discs of skeletal and cardiac muscle fibers and is fastened to the sarcolemma.

Single-unitsmooth muscleis usually made up ofcellsthatarecoupled by gap junctions, allowing ions and action potentials to pass between adjacentcells. This arrangement allows the entire sheet ofsmooth muscleto function as a unit, or asyncytium, and is characteristic of GIsmooth muscle.

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