Why does flatback posture lock a person in an extreme sympathetic tone?

• A. The thoracic spine is flat, causing the sympathetic ganglia to be extended and more active.
• B. The thoracic spine is extended, which inhibits the sympathetic ganglia.
• C. The rib cage is hyperinflated causing sympathetic overdrive.
• D. The lumbar spine orientation increases parasympathetic tone.

Answer: (A)