The skeletal system’s main purpose is to support the body, protect vital organs, allow movement, and help maintain internal balance. It also stores important minerals and produces blood cells, which are essential for health.

Support and shape

The skeleton forms a rigid framework that holds the body up and gives it shape, so the body does not collapse. This framework also helps maintain posture when standing, sitting, and moving.

Protection of organs

Bones surround and shield delicate organs from injury, such as the skull protecting the brain and the rib cage protecting the heart and lungs. This protection reduces damage from impacts and accidents.

Movement with muscles

Bones act as levers and points of attachment for muscles, allowing arms, legs, and other parts to move when muscles contract. Joints and cartilage between bones provide smooth, flexible movement.

Mineral and fat storage

Bones store minerals like calcium and phosphorus, releasing them into the blood when the body needs them. Certain cavities in bones also store fat in yellow bone marrow as an energy reserve.

Blood cell production

Red bone marrow inside some bones produces red blood cells, white blood cells, and platelets. This process, called hematopoiesis, is vital for carrying oxygen, fighting infection, and clotting blood.