Question

Answer following questions.

(a)How are smooth muscle cells different from skeletal muscle fibers and cardiac muscle cells?

(b)How are skeletal and cardiac muscle tissues similar to each other? How do these two types of muscle tissue differ from each other?

Answer 1

A) Smooth muscle cells are spindle-shaped and unstriated in appearance, whereas both skeletal and cardiac cells are cylindrical and striated in appearance. Smooth muscle cells have fewer myofibrils, found in varying length while skeletal and cardiac muscle cells have many orderly arrranged myofibrils.

B) Similarity cardiac and skeletal muscle tissue: these are cylindrical in appearnce and both are straited with orderly arranged myofibrils.

Difference: Straited muscle tissue is multinucleated and unbranced while cardiac muscle cell is uninucleated with centrally placed nucleus and is branched. Sarcolemma is well defined in straited muscles while in cardiac muscle it is not well defined. Intercalated disks are present in the cardiac muscle issue which is absent in the skeletal muscle. Skeletal muscle tissue is attached to the bones, while cardiac muscle tissue is found in the heart. Skeletal muscle tissue is voluntary while cardiac muscle tissue is involuntary.