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Bending the trunk forward (spinal flexion), such as when performing an abdominal crunch, primarily uses which muscle?
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10. Muscles
Muscle Actions
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In human anatomy, what is the basic action of any muscle?
A
To generate nerve impulses that initiate reflexes
B
To secrete synovial fluid that lubricates joints
C
To contract (shorten) and generate tension on its attachments
D
To push on bones and actively lengthen to create movement
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Understand that muscles are specialized tissues designed to produce movement by generating force.
Recognize that the fundamental property of muscle tissue is its ability to contract, meaning the muscle fibers shorten.
Know that when a muscle contracts, it generates tension on its points of attachment, typically bones or connective tissue.
Realize that this tension pulls on the bones, causing movement at the joints.
Conclude that the basic action of any muscle is to contract and generate tension on its attachments, enabling movement.
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