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the basic units of structure and function within the human body


a group of specialized cells that work together to perform the same function


structures that are composed of 2 or more different kinds of tissue


a group of 2 or more organs that work together to perform a specific function

circulatory system

transports blood to all parts of the body throughout the body

respiratory system

provides gas exchange (O2 & CO2) between the blood and the air

digestive system

breaks down foods into nutrients that can be used by the body, absorbs nutrients, & rids body of solid wastes

excretory system

filters out cellular wastes, toxins, and excess water resulting from cellular respiration

nervous system

receives & interprets stimuli from inside & outside the body to intitiate responses for survival

muscular system

provides movement

skeletal system

provides support for the body, protects internal organs, & provides attachment sites for muscles

integumentary system

skin, provides protection from infection & injury, prevents loss of water, helps regulate body temperature, & gets rid of waste

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