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Levels of Organization of Living Things

TEK 7.12.F

Katrina Meng

on 22 February 2011

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Transcript of Levels of Organization of Living Things

What classifies this dog as an Organism? Can this dog carry out basic life processes? What is an organ system? Does this system contain groups of two or more tissues that work together to perform a specific function for the organism? LEVEL4 - Organ Systems

*Groups of two or more tissues that work together to perform a specific function for the organism.

*The Human body has eleven organ systems - circulatory, digestive, endocrine, urinary, immune, integumentary, muscular, nervous, reproductive, respiratory, and skeletal. What classifies a dog brain as an organ? Do tissues work together? What classifies the image on this slide as a tissue? Do the cells work together to perform a specific activity? What classifies this as a cell? Is this a basic unit or basic building block? LEVEL 1 - Cells

*Are the basic unit of structure and function in living things.
*May serve a specific function within the organism
*Examples- blood cells, nerve cells, bone cells, etc. LEVEL 2 - Tissues

*Made up of cells that are similar in structure and function and which work together to perform a specific activity
*Examples - blood, nervous, bone, etc. Humans have 4 basic tissues: connective, epithelial, muscle, and nerve. LEVEL 3 - Organs

*Made up of tissues that work together to perform a specific activity
* Examples - heart, brain, skin, etc. Levels of Organization

In unicellular (single-celled) organisms, the single cell performs all life functions. It functions independently.

However, multicellular (many celled) organisms have various levels of organization within them. Individual cells may perform specific functions and also work together for the good of the entire organism. The cells become dependent on one another.

Multicellular organisms have the following 5 levels of organization ranging from simplest to most complex: LEVEL 5 - 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.
*Usually made up of organ systems, but an organism may be made up of only one cell such as bacteria or protist.
*Examples - bacteria, amoeba, mushroom, sunflower, human
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