The thoracic and sacral curvatures of the vertebral column are ________ while the cervical and lumbar curvatures are _. A) convex; concave B) secondary; primary C) concave; convex D) S ^-shaped; C ^-shaped

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The thoracic and sacral curvatures are concave anteriorly (convex posteriorly), while the cervical and lumbar curvatures are convex anteriorly (concave posteriorly).

The Thoracic and Sacral Curvatures of the Vertebral Column Are