Indicate whether each of the following descriptions better applies to cardiac (C), skeletal (K), myoepithelial (M), or smooth (O) muscle cells. Your answer would be a four-letter string composed of letters C, K, M, and O only, e.g. MMKC.
( ) They are derived from the ectoderm layer, similar to epithelial cells.
( ) They form the lining of cavities such as the urinary bladder.
( ) They are responsible for most voluntary muscle movements.
( ) They form multinucleated and exceptionally long muscle fibers.

Question

Indicate whether each of the following descriptions better applies to cardiac (C), skeletal (K), myoepithelial (M), or smooth (O) muscle cells. Your answer would be a four-letter string composed of letters C, K, M, and O only, e.g. MMKC.
( )	They are derived from the ectoderm layer, similar to epithelial cells.
( )	They form the lining of cavities such as the urinary bladder.
( )	They are responsible for most voluntary muscle movements.
( )	They form multinucleated and exceptionally long muscle fibers.

Quizplus · Accepted Answer

Myoepithelial cells lie in epithelia and, like epithelial cells, are derived from the ectoderm layer. Smooth muscle cells line cavities such as the urinary bladder and the gut. Skeletal muscle cells have a striated appearance (similar to cardiac muscle cells), are multinucleated and very long, and power most voluntary movements of an animal.

Indicate Whether Each of the Following Descriptions Better Applies to Cardiac