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Sarcomere Shortening
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Sarcomere Shortening – this is the same animation (with a different narrator but the text is the same) as Sarcomere Contraction immediately above.

View the animation below, then complete the quiz to test your knowledge of the concept.






1The area of the muscle fiber where the actin and myosin myofilaments overlap is the...
A)A band
B)I band
C)H zone
D)Z disk
E)sarcomere



2During contraction, the actin myofilaments slide toward the...
A)A band
B)I band
C)H zone
D)Z disk
E)sarcomere



3The distance from one Z disk to the next Z disk is called a(n)...
A)A band
B)I band
C)H zone
D)Z disk
E)sarcomere



4In fully contracted muscles, the actin filaments lie side-by-side.
A)True
B)False



5In a relaxed muscle, the ends of the actin filaments overlap.
A)True
B)False







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