D 1.1 Skeletal System What does the Skeletal System do?

Skeletal System  Bones are living  Skeletal system has five functions  Gives shape and support  Protects internal organs  Muscles attach to bones  Blood cells are formed in the marrow  Stores calcium and phosphorus

Skeletal System  206 bones in the human body  Compact bone – contains bone cells, blood vessels, and calcium deposits  Spongy bone – small, open spaces to make bones lightweight  Marrow – in spongy bone and produces red blood cells  Cartilage – flexible bone that aids in motion  Ligament – connects bone to bone at joints

Skeletal System  Joints – place where bones meet  Immovable joint – skull  Ball and socket – shoulder, hip  Hinge – knee, elbow  Gliding – vertebrae, wrist  Pivot – arm, leg

Cranium Mandible Skull Clavicle Scapula Sternum Humerus Rib cage Vertebral Column Radius Ulna Forearm Pelvis

Carpals Metacarpals Phalanges Femur Patella Tibia Fibula Tarsals Phalanges Metatarsals