59. Which of the following descriptions regarding muscle is correct?
(A) The length of thick filament will change in fully muscle contraction.
(B) A motor unit consists of multiple motor neurons and muscle fibers.
(C) Myoglobin binds oxygen tighter than hemoglobin does.
(D) Ca²⁺ binds with tropomyosin to initiate muscle contraction.
(E) Insect's skeletal muscles are grossly different from those of vertebrates.

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