Levels of Organization

Life is organized into 5 levels: Cells Tissues Organs Organ systems Organisms

There are 5 Levels of Organization in Multicellular Organisms: 1. Cells 2. Tissues 3. Organs 4. Organ Systems 5. Organisms

the CELL The cell is the basic unit of structure and function of a living thing. Cells are specialized by size and shape for the job they do The amoeba above is made of only one cell and it must perform all the jobs of the organism.

T I S S U E S Tissues are Made up of cells that are similar in structure and function and which work together to perform a specific activity Examples: 4 different types of animal tissues are epithelial, muscle, nervous, and connective. This pink sponge has only cells but they are not organized into tissues. The blue Man-o-war has tissues but no organs.

Organs Organs are made up of different tissues that work together to perform a specific activity. Example: a heart is an organ made of all four tissues, this coral polyp is an organ and a leaf is a plant organ.

Organ Systems An organ system is a group of organs working together to perform a specific function for the organism Example: Human organ systems include circulatory, reproductive, digestive, nervous, respiratory. Plant organ system-roots, stems,leaves= transport system.

Organisms Entire living things that can carry out all basic life processes. Meaning they can take in materials, release energy from food, release wastes, grow, respond to the environment, and reproduce.