A Muscle Fiber Shortens When ___ Filaments Essentially Climb Along

question 98

Multiple Choice

A muscle fiber shortens when ___ filaments essentially climb along ___ filaments,producing a shortened fiber and a contracted muscle.

• A)myosin,actin
• B)actin,acetylcholine
• C)acetylcholine,myosin
• D)actin,myosin

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Definitions:

Ulna

One of the two long bones in the forearm, extending from the elbow to the smallest finger, and playing a role in arm movement and stability.

Biceps Brachii

A muscle of the upper arm that acts to flex the elbow and rotate the forearm.

Brachialis

A muscle located in the upper arm that is primarily responsible for flexing the elbow.

Teres Major

A muscle of the upper limb that assists in the rotation and adduction of the arm.