The lumbar spine consists of which vertebrae?

• A. T1-T12 vertebrae in chest
• B. L1-L5 vertebrae in lower back
• C. Fused vertebrae forming pelvis base
• D. Tailbone

Answer: (B)

The main idea is identifying how the spine is organized into regions and which bones belong to the lumbar area. The lumbar spine comprises five vertebrae, labeled L1 through L5, and is located in the lower back between the thoracic spine above and the sacrum below. These vertebrae are larger and handle much of the body's weight, providing both stability and flexibility to the lower back.

The other descriptors point to different regions: thoracic vertebrae (T1–T12) are in the chest and articulate with the ribs; the sacrum is formed by five fused vertebrae at the base of the spine and is part of the pelvis; the tailbone refers to the coccyx, the small bone at the very end of the spinal column.