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Organization of the Body Organization of the Body Levels of Organization There are five levels of organization found in living things. Mouth Liver Esophagus Stomach 1. Cells 2. Tissues Small intestine Large intestine 3. Organs 4. Organ systems 5. Organisms The Digestive System Organization of the Body Cells You learned in the last unit that cells are the basic unit of life. Although some living things exist as a single cell, most living things are made of many cells, and those cells combine to form different parts that have different jobs in a living thing. Organization of the Body Tissues Tissues are a group of cells that work together to perform a similar function (job). Blood, bones and your nerves are examples of tissues. There are four types of tissue: 1. Connective 2. Epithelial 3. Muscle 4. Nerve. Skeletal muscle tissue from Jagiellonian University Medical College retrieved from Wikimedia on 11/27/09. Organization of the Body Organs Organs are made of a group of tissues and have a specific job to do in the body. Examples of organs are stomach, heart, brain, intestines, liver, and kidneys. Kidney Liver Heart Organization of the Body Organ Systems Organ systems are a group of organs that work together to perform a specific function in the body. There are ten organ systems in the human body: 1. Circulatory 6. Nervous 2. Respiratory 7. Excretory 3. Digestive 8. Immune 4. Skeletal 9. Reproductive 5. Muscular 10. Endocrine The digestive system Organization of the Body Organisms An organism is a living thing. Organisms are able to take in food, release wastes, reproduce, grow, and respond to the environment. Some organisms are made of only one cell like bacteria and protists. Other organisms are made of many organ systems like plants, fungi, and animals.