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Levels of Organization Cells Unit 7th Grade Science Levels of Organization • 1st : Cells—the basic unit of living things • 2nd: tissues—made of many cells that work • • • together 3rd: organs—made of tissues that work together. 4th: organ system—made of organs that work together 5th: organism= made of organ systems that work together; an entire living thing A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: the circulatory system is one of many systems in the human body, as well as in many other organisms. It is made up of the heart and blood vessels. Function: the circulatory system transports oxygen and food to all cells in the body through the blood A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: the stomach is part of the digestive system in many animals Function: to break down food, and store it to later be absorbed by the intestines into the blood Cells, tissues, organs, organ systems, or organisms? Where are they found? What do they do? Found: these are various tissues found inside the human body -epithelial tissue (skin, inside of cheek, etc.) -nervous tissue (brain and nerves) -muscle tissue -connective tissue (tendons) Function: each tissue has its own function, what do you think they are? Cells, tissues, organs, systems, or organisms? Where are they found? What do they do? Found: these are different types of red and white blood cells found in our blood -what level is our blood? Function: red blood cells transport oxygen to other cells and organs, and white blood cells fight off diseases A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: in China Function: to live and survive in the wild A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: in our brain, our nervous tissue is made up of millions of these cells Function: neurons transmit signals to body parts to tell them what to do A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: muscles are organs found all over our bodies Function: they help us to move, pump blood, and support our skeleton A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: paramecium are one-celled organisms that are often found in pond water Function: to live and survive in their environment A cell, tissue, organ, system, or organism? Where is it found? What does it do? Found: the brain is an organ in our nervous system Function: sends and receives signals throughout the body