Organization of Life

Made of Cells: All living things are composed of one or more cells Made of Cells: All living things are composed of one or more cells. Cell – membrane-covered structure that contains all of the materials necessary for life Unicellular - uni = one; made of one cell Different cell parts within the cell perform different functions Multicellular – multi = many; made of many cells Different cells have specialized functions

Organization of Life If a group of cells work together to perform a specific job in the body then they form tissues. Muscle cells working together to form muscle tissue

Tissues: Cells working together Epithelial: (skin) covers and protects underlying tissue. Nervous: sends signals throughout the body

Tissues: Cells working together Muscle: composed of cells that can contract and relax to produce movement Connective: (blood, collagen) joins, supports, protects, nourishes, and cushions organs

Tissues

Organization of Life If two or more tissues work together to perform a specific job in the body then they form an organ. Ex. Stomach, heart, skin Stems, roots

Organization of Life If two or more organs work together to perform a specific job in the body then they form an organ system. Ex. Digestive system, Circulatory System, Respiratory System. (What does each of these systems do in your body?)

Organization of Life An organism is anything that can live on its own. Unicellular: A single cell living on its own. Ex: ameba, paramecium Multicellular: Multiple cells that rely on each other for survival. Most of the cells in a multicellular organism cannot live outside the body. Ex. Us

Tying it all Together