43. Which of these statements about muscle contraction is FALSE?
(A) Ca2+ is required for all muscle contraction.
(B) Troponin is present in skeletal muscles and smooth muscles.
(C) When a skeletal muscle shortens during contraction, the H band and sarcomere shorten.
(D) Skeletal muscles but not cardiac muscles require neural stimulation to contract.
(E) The sarcoplasmic reticulum and transverse tubules are well-developed in skeletal muscles and poorly developed insmooth muscles. 

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