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Life depends on five environmental factors water food oxygen heat pressure Survival Needs.

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Presentation on theme: "Life depends on five environmental factors water food oxygen heat pressure Survival Needs."— Presentation transcript:

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2 Life depends on five environmental factors water food oxygen heat pressure Survival Needs

3 Water - most abundant substance in body - required for metabolic processes - required for transport of substances - regulates body temperature Food - provides necessary nutrients - supplies energy - supplies raw materials Survival Needs

4 Oxygen (Gas) - one-fifth of air - used to release energy from nutrients Heat - form of energy - partly controls rate of metabolic reactions Pressure - application of force on an object - atmospheric pressure – important for breathing - hydrostatic pressure – keeps blood flowing Survival Needs

5 Homeostasis Maintenance of a stable internal environment Homeostatic imbalance – a disturbance in homeostasis resulting in disease Temperature Hydration Sugar level Blood pressure

6 Feedback Mechanisms Negative feedback Includes most homeostatic control mechanisms Shuts off the original stimulus, or reduces its intensity Works like a household thermostat

7 Monitor aspects of the internal environment and corrects any changes Homeostatic Mechanisms Receptors - provide information about stimuli Control center - tells what a particular value should be (includes a set point) Effectors - elicit responses that change conditions in the internal environment

8 The body communicates through neural and hormonal control systems

9 CONTROL CENTER RECEPTOR EFFECTOR RESPONSE STIMULUS: DECREASE IN EXTERNAL TEMPERATURE Feedback Mechanisms

10 Positive Feedback Increases the original stimulus to push the variable farther In the body this occurs only in blood clotting and child birth Feedback Mechanisms

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