Biology (Mader), 10th Edition

Chapter 39: Locomotion and Support Systems

Sarcomere Shortening

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.



1.

The 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
2.

During contraction, the actin myofilaments slide toward the...
A)A band
B)I band
C)H zone
D)Z disk
E)sarcomere
3.

The 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
4.

In fully contracted muscles, the actin filaments lie side-by-side.
A)True
B)False
5.

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