객관식
In human anatomy, what is the basic action of any muscle?
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10. Muscles
Muscle Actions
객관식
In standard anatomical position, what is the primary action of the erector spinae muscle group when contracting bilaterally?
A
Extension of the vertebral column (spinal extension)
B
Flexion of the vertebral column (spinal flexion)
C
Depression and retraction of the scapula
D
Extension of the knee joint
검증된 단계별 안내1
Step 1: Understand the anatomical position and the muscle group involved. The erector spinae is a group of muscles located along the vertebral column, primarily responsible for movements of the spine.
Step 2: Identify the meaning of 'contracting bilaterally.' This means both the left and right sides of the erector spinae muscles contract simultaneously.
Step 3: Recall the primary actions of the erector spinae muscles. When both sides contract together, they act to extend the vertebral column, which means bending the spine backward.
Step 4: Differentiate this action from other options: spinal flexion (bending forward), scapular movements (which involve different muscles), and knee joint extension (which involves leg muscles).
Step 5: Conclude that the primary action of the erector spinae contracting bilaterally is extension of the vertebral column (spinal extension).
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