The Skeletal System  Function  Support  Protect Organs  Produce Blood  Movement  Store Calcium  Store Fat Form

Bones  Strong  Light  Living Tissue  Non Living Tissue  Nerves  Blood Vessels  Connective Tissue

Joints  Where two or more bones come together  Needed for movement  Usually surrounded by cartilage or a fluid filled bursa (sack)  Amount of Movement depends on joint type

Mammals  Similar bone design and structure  Individual differences related to size, number and function are common but form is very close

Skeleton on fish  Some made of bone (Pike, Walleye, Salmon, Blue Gill etc)  Some made entirely of cartilage (Shark, Sting Ray)

Skeleton of Birds  Light  Filled with many pores and holes  Light weight for flight

Skeleton Reptiles  Form of Skeleton matches function  Very diverse Skeleton forms

Support for Sponges and Coral  Fibrous network of Calcified minerals  Algae gives Coral Color  Very simple  Does not allow movement

Mollusks and shelled Organisms  Protection provided by shell  Shell made of calcium rich minerals  Different organisms have different shell designs  Internal structure is provided by hydro- pressure (Water Pressure)

Arthropods (Insects and Crustaceans)  Exoskeleton  External skeleton made a polysaccharide called chitin  Growth is through molting  Exoskeleton limits size of organism  Common in Invertebrates (animals with out backbones)

Worms  Support is internal Hydro pressure  Protection is through tough muscular outer membrane

Plants  Xylem= Cell type that provides structure to trees (wood)  Hydro pressure water provides turgor or internal support through storage in the vacuole  Plant cells have cell walls made of cellulose for support  Phloem, or bark provides protection

Protozoan  Support is internal based on internal hydro pressure  Protection is through a semi permeable cell membrane

Bacteria  Cell wall provides protection and support