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Friday, December 14th Bellwork: Complete #1 on page 39 Organism a living thing that can carry out life processes by itself Unicellular Multicellular one-celled organism organism made up of more than one cell Quick Discussion: Get with your activity partner and discuss the benefits and disadvantages of being unicellular and multicellular. Record your answers on your notes under pros/cons. 1 Pros: -need fewer resources -some can live in harsh conditions like hot springs and super salty water -no levels of organization Cons: -no levels of organization -entire organism dies if the single cell dies. Pros: -grouped into different levels of organization. -larger size = longer life span -cells are specialized for certain jobs -cells depend on one another to perform all of the functions in organism needs to live. Cons: -need more resources -cells depend on one another to perform all of the functions in organism needs to live. Cell - smallest functional and structural unit of all living organisms *We have over 200 different types of cells in our bodies! 2 Tissue a group of similar cells that perform a common function. ANIMALS 4 types of tissue 1. Nervous tissue functions as a messaging system within the body. 2. Epithelial protective and forms boundaries (ex: skin) 3. Connective holds parts of the body together and provides support and nourishment to organs (ex: bones and blood) 4. Muscle helps produce movement PLANTS 3 types of tissue 1. Transport move water and nutrients through the plant 2. Protective protects the outside of the plant. 3. Ground provides internal support and storage and absorbs light energy to make food in photosynthesis List all of the organs you know! 3 Organ structure made up or a collection of tissues that carries out a specialized function. Animal Example: Organ stomach Function breaks down food for digestion nervous tissue sends messages to the stomach’s muscle tissue to tell muscle to contract so that food and stomach acid can mix and break down food. Plant Example: Organ leaf Function conduct photosynthesis Leaves are made up of protective tissue which is used to reduce water loss, ground tissue for conducting photosynthesis, and transport tissue for moving the nutrients from the leaves to the stems. You have 11 systems in your body, depending on how you organize the organs working together. How many can you name? 4 Organ Systems a group of organs that work together to perform body functions. each one has a specific job to do for the organism. Example: stomach works with other organs of the digestive system to digest and absorb nutrients from food. Other organs of the digestive system include: esophagus, small & large intestine. **If you put all of your organ systems together you have an ORGANISM! Body Systems: http://www.youtube.com/watch?v=0yjLJfz6saU 5 Starting with the least complex place the following terms in order: cells, organism, tissue, organ system, organ Analogy of Organization in our Bodies: 1. Cell = PERSON 2. Tissue = TEACHERS 3. Organ = Teachers, Counselors, Administration, Cafeteria workers, Custodians, etc. 4. Organ system = SCHOOL 5. Organism = COMMUNITY Which is Which? Decide whether each of the following is an example of a cell, tissue, organ, organ system, or of an organism. Write your answer on the line in front. A. Cell B. Tissue C. Organ D. Organ System E. Organism ______ 1. Nervous System ______ 9. Bicep ______ 2. Chicken ______ 10. Oak Tree ______ 3. Knee Cap ______ 11. Eye ______ 4. Stem Cell ______ 12. Lungs ______ 5. Tongue ______ 13. Skin ______ 6. Elbow ______ 14. Endocrine System ______ 7. Leaf ______ 15. Muscle Cell ______ 8. Kidney ______ 16. Red Blood Cell 6