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Human Body Systems
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Organization of the Body
Teamwork!
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Levels of Organization
Cells Tissues Organs Organ Systems Organism
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Cells The basic unit of all living things.
Specialized cells perform a particular function.
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Tissues Tissues are groups of similar cells that perform a single function. 4 Types: Connective Muscle Nervous Epithelial Bone Adipose Cardiac Muscle Skeletal Muscle Neural Tissue Cartilage
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Organs An organ is a group of tissues that work together to perform a complex function. Examples: Heart Eye Brain Stomach Lungs
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Organ Systems A group of organs that perform closely related functions.
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11 Organ Systems Nervous Respiratory Integumentary Digestive
Excretory Skeletal Muscular Circulatory Endocrine Reproductive Lymphatic/Immune
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Organism An individual animal, plant or single-celled life form
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STOP HERE!
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Homeostasis The organ systems are working constantly to maintain a controlled, stable environment = Homeostasis. Homeostasis in the body is maintained by feedback loops.
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Feedback Loop Positive and negative feedback
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