Compact bone serves several vital functions: 1. Support: It provides a rigid framework that supports the body and maintains its shape. 2. Protection: It shields vital organs from mechanical damage. 3. Movement: It serves as an attachment site for muscles, facilitating movement. 4. Mineral Storage: It acts as a reservoir for minerals, such as calcium and phosphorus. 5. Blood Cell Production: In certain bones, it houses bone marrow, which produces blood cells.