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Which of the following actions is not performed concentrically by the trapezius muscle?
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10. Muscles
Muscle Actions
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When does a muscle perform an action, during contraction or relaxation?
A
Only when both contracting and relaxing
B
Neither contracting nor relaxing
C
During relaxation
D
During contraction
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Understand the basic physiology of muscle action: Muscles perform actions by contracting, which involves the shortening of muscle fibers to produce movement.
Recognize that muscle contraction is an active process requiring energy, primarily in the form of ATP, to facilitate the interaction between actin and myosin filaments within the muscle cells.
Differentiate between contraction and relaxation: Contraction is the phase where muscles generate force and perform work, while relaxation is the phase where muscles return to their resting state and do not perform work.
Identify that during contraction, muscles pull on bones or other structures to create movement, such as lifting a weight or bending a joint.
Conclude that the action of a muscle, in terms of performing work or movement, occurs during the contraction phase, as this is when the muscle exerts force.
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