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MCAT Question A Day - 8/29/14 - Answer!

During a muscular contraction:

A.  both the thin and thick filaments contract.
B.  the thin filament contracts, but the thick filamendoes not.
C.  the thick filament contracts, but the thin filament does not.
D.  neither the thin nor the thick filament contract.

D is correct. Neither actin (the thin filament) nor myosin (the thick filament) changes its length during a muscular contraction; instead the proportion of actin and myosin overlap increases.

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