Smooth muscle differs from striated muscle in many ways. Which of the following

Question

Smooth muscle differs from striated muscle in many ways. Which of the following statements about the differences between smooth and striated muscle is NOT true?

a) Striated muscle cells organize their thick and thin filaments into sarcomeres, while smooth muscle cells scatter clusters of thick and thin filaments throughout the cytoplasm.

b) Striated muscle cells anchor thin filaments to Z disks, while smooth muscle cells anchor thin filaments to the cell membrane (via adhesion plaques) and to the cytoskeleton (via dense bodies).

c) Striated muscle has T-tubules while smooth muscle does not.

d) The sarcoplasmic reticulum is much more extensive in smooth muscle than in striated muscle.

e) The ratio of thin filaments to thick filaments is greater in smooth muscle than in striated muscle.

Explanation / Answer

d. sarcoplasmic reticulum is much more extensive in smooth muscle than in striated muscle. FALSE.

(Smooth muscle cells also do not possess T tubules and do not have a very extensive sarcoplasmic reticulum. )

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