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How Your Body Is Organized
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Levels of Organization
• Organized from Simple to Complex– 1. Cells– 2. Tissues– 3. Organs– 4. Organ Systems– 5. Organism
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Cells
• Definition: Cell is the basic unit of structure and function
• Your body contains about 100 trillion cells• Cells are tiny and only can been seen with
a microscope• Each cell contains a nucleus, cytoplasm,
cells membrane & other organelles• Cells carry on processes that keep
organisms alive
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Tissues
• Definition: A group of similar cells performing the same function.
• 4 types:– 1. Muscle– 2. Nerve: brain, spinal cord, nerves– 3. Connective: blood, fat, cartilage, bones,
tendons– 4. Epithelial: covers surfaces of body
(outside/inside)
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Tissue Types(Found on page 8)
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Organs
• Definition: Different types of tissue that perform a specific job
• Examples: Heart, liver, lungs, stomach, intestines
• The Heart contains all 4 kinds of tissue and each tissue type contributes to the overall job of pumping blood.
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Examples of OrgansHeart Liver
LungsStomach
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Organ Systems
• Definition: Group of organs that work together to perform a major function
• Systems depend on each other.
(Types of Organ Systems on Following Slides
Found on Page 9)
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Circulatory System• Carries materials to
cells and wastes away from cells.
• Helps fight disease
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Digestive System
• Takes in food breaks it down, and absorbs digested materials
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Skeletal System• Supports body,
protects, works with muscle to allow movement.
• Stores some materials
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Excretory
• Removes wastes
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Nervous
• Detects, interprets information
• Controls most body functions
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Muscular
• Enables body to move
• Moves food through digestive system
• Keeps heart beating
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Immune• Fights disease
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Endocrine • Controls body
processes by means of chemicals
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Reproductive
• Produces sex cells that can unite with other sex cells to create offspring
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Respiratory System
• Takes oxygen into body and eliminates carbon dioxide
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Integumentary System (skin)
• Protects body • Keeps water in• Helps to regulate
body temperature
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Assignment
• Coloring Diagrams:– Cell & Tissue– Tissue & Organ
– Staple and attach to the notes with finished.