Presentation on theme: "Necessary Life Functions"— Presentation transcript:
1 Necessary Life Functions Maintain BoundariesMovementLocomotionMovement of substancesResponsivenessAbility to sense changes and reactDigestionBreak-down and delivery of nutrients
2 Necessary Life Functions Metabolism – chemical reactions within the bodyProduction of energyMaking body structuresExcretionElimination of waste from metabolic reactionsReproductionProduction of future generationGrowthIncreasing of cell size and number
3 Survival Needs Nutrients Oxygen Water Stable body temperature Chemicals for energy and cell buildingIncludes carbohydrates, proteins, lipids, vitamins, and mineralsOxygenRequired for chemical reactionsWater60–80% of body weightProvides for metabolic reactionStable body temperatureAtmospheric pressure must be appropriate
4 Homeostasis Maintenance of a stable internal environment a dynamic state of equilibriumHomeostasis must be maintained fornormal body functioningto sustain lifeHomeostatic imbalancea disturbance in homeostasisresulting in disease or diagnosis
5 Maintaining Homeostasis The body communicates through neural and hormonal control systemsReceptorResponds to changes in the environment (stimuli)Sends information to control centerControl centerDetermines set pointAnalyzes informationDetermines appropriate responseEffectorProvides a means for response to the stimulus
6 Feedback Mechanisms Negative feedback Positive Feedback Includes most homeostatic control mechanismsShuts off the original stimulus, or reduces its intensityWorks like a household thermostatPositive FeedbackIncreases the original stimulus to push the variable fartherIn the body this occurs only in blood clotting and child birth
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