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zygote Cell formed from fusion of egg and sperm. Embryonic Stem Cells First cells produced from zygote that have potential to become any type of cell. Differentiation Process by which committed cells acquire the structure and functions of highly specialized cells. Tissues Groups of similar cells that work together to perform specialized function. Thermoregulation Process of maintaining steady body temperature. Homeostasis Regulation and maintenance of internal environment that supports life. Positive Feedback Uses information from sensors to increase rate of change. Feedback information from sensors that allows control centers to compare current conditions to set of ideal values. Negative Feedback Control system that counteracts any change in body the moves condition above or below set point. Targets Any organ, tissue, or cell that changes its level of activity in response to message. Sebaceous Glands Produce oil to keep skin flexible and waterproof. Actin and Myosin A filament that is pilled by myosin filaments to cause muscle contraction. Skeletal Muscle Muscle tissue that is attached to the skeletal system and when contracted moves the bone. Smooth Muscle Muscle tissue that moves substances. Dermis Second layer of skin that includes structural proteins, blood vessels, glands, and hair follicles. Ligaments Long flexible band on connective tissue that joins two bones across a joint. Integumentary System Sweat in hot weather to cool you down.