Human Biology & Health Ch 1 Section 1 and 2
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| cell | basic unit of structure and function in a living thing
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| cell membrane | forms the outside boundary of the cell
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| nucleus | the control center that directs the cell's activities and contains the information that determines the cells form and function
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| cytoplasm | clear, jellylike substance containing many cell structures called organelles
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| tissue | a group of similar cells that perform the same function
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| muscle tissue | can contract and shorten, the muscle tissue make parts of your body move
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| nervous tissue | directs and controls the process,& carries electrical messages back and forth between the brain and other parts of the body
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| connective tissue | provides support for your body and connect all its parts, examples are bone and fat tissues
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| epithelial tissue | protects the delicate structures of the body; skin is epithelial tissue. the lining of your digestive system is also epithelial tissue that allows you to digest and absorb nutrients in your food
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| organ | is a structure that is composed of different kinds of tissue and performs a specific job
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| organ system | a group of organs that work together to perform a major function
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| homeostasis | the process in which the body is kept stable in spite of the changes in the external environment
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| stress | the reaction of your body to potentially threatening , challenging or disturbing events
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| skeleton | is made up of all the bones in your body
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| vertebra | the 26 small bones that make up your backbone
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| joint | is a place in the body where two bones come together
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| ligament | strong connective tissue that holds bones together
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| cartilage | a connective tissue that is more flexible than bone and that protects the ends of bones and keep them from rubbing each other
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| compact bone | hard, dense bone tissue that is beneath the outer membrane of a bone
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| spongy bone | a layer of bone tissue having many small spaces and found just inside the layer of compact bone
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| marrow | the soft connective tissue that fills the internal spaces in bone
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| osteoporosis | a condition in which the body's bones become weak and break easily
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