Which defines a muscle as contracting?
A)myosin-actin cross-bridges
B)shortening
C)lengthening
D)staying the same length

Name: Which defines a muscle as contracting? A)myosin-actin cross-bridges B)shortening C)lengthening D)staying the same length
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Question

Quizplus · Accepted Answer

A muscle contracts when the myosin filaments form cross-bridges with the actin filaments, resulting in a sliding of the filaments and shortening of the muscle. Therefore, myosin-actin cross-bridges define a muscle as contracting.

Which Defines a Muscle as Contracting