The heart is not protected by a bony structure?

The statement is incorrect. The heart is protected by a bony structure called the ribcage. The ribcage is formed by 12 pairs of ribs, which are attached to the spine and sternum. The ribs form a cage-like structure that surrounds and protects the heart, lungs, and other organs in the chest. The ribcage provides structural support, protects the organs from injury, and assists in breathing by expanding and contracting to allow air to flow in and out of the lungs.