Asynchronous flight muscles in insects are able to achieve contractions in the range of 250-1000 Hz because
A) They have very fast Ca2+ATPase pumps.
B) They have muscles that don't depend on Ca2+regulation at all.
C) They have very high amounts of parvalbumin in the cytosol.
D) The TnC can rapidly change its affinity for Ca2+, leading to rapid contraction/relaxation cycles.
Answer: D
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