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Homeostasis

Definitions around Homeostasis

TermDefinition
What is Homeostasis It is the control of an organism's internal environment in order to maintain optimal conditions
What causes Homeostasis? Stimuli (change)
How does Homeostasis work? Sensory perceptions or senses pick up change in external environment. Nerves in skin and Hypothalamus pick up changes in internal environment.
What factors does Homeostasis affect? Temperature, Oxygen, Water, Glucose, pH (acidity in H+ ions), Salts.
What factors affect it? Health and how well your body copes with change
What is it's significance or importance? The factors would become uncontrolled and lead to death.
What does "optimal" mean Best or most favourable
What is an optimal environment? The most favourable conditions for your body.
Name the standard response and the 5 stages Stimulus - Sensor - Communication - Effectors - Response
What is negative feedback? When the response to the stimulus has been finalised and optimal conditions have been reached, the sensor sends a message to the control centre - effectors - and these are turned off and conditions return to normal.
What is positive feedback? This is an increase in change away from optimal conditions - the homeostatic mechanism is not switched off and therefore the effectors keep doing their job, putting things out of balance.
Give an example of positive feedback that is beneficial? Labour and birth - Oxytocin is the body's response to labour and stimulates powerful contractions and allows for birth. It increases as labour progresses.
Created by: saltpopcorn
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