Final answer:
The three major bones that protect internal organs in the body are the cranium, vertebral column, and rib cage, which protect the brain, spinal cord, and thoracic organs, respectively.
Step-by-step explanation:
The three major bones that protect internal organs in the body are:
The cranium (skull), which encloses and protects the brain.
The vertebral column (spine), which protects the spinal cord.
The rib cage, composed of ribs and sternum, which protects the heart, lungs, and major blood vessels.
These components of the skeletal system are crucial as they support and safeguard the delicate tissues of vital internal organs. The ribs and cartilage are also capable of expanding and contracting to allow for breathing and other internal organ movements. Additionally, bones like the cranium and vertebral column provide a hard enclosure, minimizing the risk of trauma to the brain and spinal cord, respectively.