What is one of the key roles of flat bones in the body?

Flat bones play a crucial role in protecting internal organs, which is why this answer is correct. These bones are typically thin and curved, providing a shield-like feature that encases and safeguards vital organs in the body, such as the brain, heart, and lungs. For instance, the skull protects the brain, while the rib cage protects the heart and lungs from injury.

While support and weight-bearing typically involve long bones, flat bones mainly serve protective functions and are not specifically designed to facilitate muscle contractions or store fats. These other functions are more associated with different types of bones or systems within the body. Flat bones' primary structural role is to provide a strong yet lightweight formation that ensures essential organs are shielded from external forces.