Question

question 42

curvatures of the spine serve the body by ______.

a - giving additional springiness and flexibility to the spine which absorbs shock
b - applying greater pressure to the intervertebral disks preventing them from slipping
c - limiting the flexibility of the spine and preventing hyperextension
d - providing space for soft organs in the various body cavities

Explanation:

Analyze the question prompt

The question asks about the physiological purpose of the natural curvatures of the spine.

Evaluate the physiological function

Using the Vertebral Column Anatomy knowledge point

• The four natural curves of the adult vertebral column (cervical, thoracic, lumbar, and sacral) increase its strength, help maintain balance in the upright position, absorb shock during walking or running, and protect the column from fracture.
• They provide flexibility and springiness, acting like a supportive spring rather than a rigid rod.

Assess the given options

• Option A: "giving additional springiness and flexibility to the spine which absorbs shock" directly matches the primary biomechanical function of spinal curvatures.
• Option B: Curvatures do not serve to apply greater pressure to intervertebral discs; excessive pressure is actually detrimental.
• Option C: Curvatures increase flexibility rather than limiting it.
• Option D: While the thoracic and sacral curves accommodate thoracic and pelvic organs, the primary dynamic service to the body as a whole is shock absorption, flexibility, and springiness. Option A is the most complete and standard physiological explanation.

Answer:

• A - giving additional springiness and flexibility to the spine which absorbs shock (Correct answer)
• B - applying greater pressure to the intervertebral disks preventing them from slipping
• C - limiting the flexibility of the spine and preventing hyperextension
• D - providing space for soft organs in the various body cavities