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one-celled organism amoeba proteus single-celled bacteria of the type: E. coli Cells Structure, Function and Organization human red blood cell plant cell from the leaf of a poplar tree LEVELS OF ORGANIZATION • The levels of organization in complex organisms, including most plants and animals, consist of cells, tissues, organs, and organ systems. Organization of living organisms • system • tissue • Cell • organ What is a Cell? • Cell is the basic unit of structure and function in living things. Function • In complex organism you can find different kinds of cells. • Each cell or group of cells has a specific job. Organization of living organisms • system • tissue • organ • Cell http://player.discoveryeducation.com/index.cfm?guidAssetId=1D3C Tissue in the Human body Tissue • A group of similar cells that perform the same function. • The animal body has 4 types of tissue: – Muscle – Nerve – Connective – Epithelial Muscle tissue • It is a contractile tissue of the body. Contraction of the muscle tissue functions to make parts of the body to move. • The 3 types of muscle tissue are cardiac, smooth, and skeletal Nerve tissue • Directs and control the body. • Carries messages back and forth. • Tissue is specialized to react to stimuli and to conduct impulses to various organs in the body which bring about a response to the stimulus. • Nerve tissue (as in the brain, spinal cord and peripheral nerves that branch throughout the body) are all made up of specialized nerve cells called neurons Brain??? Connective tissue • Provide a framework, protects tissues and organs, connects all the parts of the body and support its structure. • Specialized forms of connective tissue. – Cartilage and bone; protect internal structures and give support to the body – Fat; insulation Epithelial tissue • Membranous tissue covering internal organs and external surfaces of the body. • Functions: – Protects internal/external structures – Absorb or release substances Organization of living organisms • system • tissue • organ • Cell http://player.discoveryeducation.com/index.cfm?guidAssetId=1D3C Organs • Structure composed by different kinds of tissue and has an specific function. Organs • Each organ is part of a system! Organization of living organisms • system • tissue • organ • Cell http://player.discoveryeducation.com/index.cfm?guidAssetId=1D3C Organ system bp • Consist of organs that interact physically, chemically, or both to perform a common function. • Functions – maintain stable internal conditions. – acquire nutrients and raw materials – dispose of wastes – protect the body against injury and attack – allow reproduction and nourishment of young. Organ system Organ System • We are going to learn about eleven organ systems that contribute to the survival of the living cells of the vertebrate body: • Integumentary • Muscular • Skeletal • Nervous • Endocrine • Circulatory • Lymphatic • Respiratory • Digestive • Urinary • Reproductive Rap of the systems • Systems song HOMEOSTASIS • The organ systems in an organism work together to maintain homeostasis- the process by which an organism’s internal environment is kept stable in spite of changes in the external environment. • Three examples of homeostasis are: • Water Balance • Maintaining Temperature • Responding to Stimuli