Homeostasis and Negative Feedback
- Created by: Rosie Young
- Created on: 30-09-13 15:28
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- Homeostasis and Negative Feedback
- Conditions
- Temp
- glucose levels
- salt conc.
- water potential of blood
- blood pressure
- CO2 levels
- Negative feedback
- Optimum conditions
- change away from optimum
- receptor detects change
- communications system detects error
- effector reacts to reverse change
- return to optimum conditions
- effector reacts to reverse change
- communications system detects error
- receptor detects change
- change away from optimum
- sensory receptors
- temperature receptors or glucose conc. receptors
- monitor conditions
- communications system
- nervous or hormonal
- transmits messages from receptors to effectors
- Effector Cells
- muscles cells or liver cells
- reverse the change
- Reversal of any change in conditions.
- Optimum conditions
- Positive feedback
- increases any change detected by the receptors.
- Body too cold
- inactive enzymes
- slower exergonic reactions
- body cools further
- slower exergonic reactions
- inactive enzymes
- cervix begins to stretch
- signal to anterior pituitary gland
- secretion of oxytocin
- cervix stretches more
- more oxytocin released.
- cervix stretches more
- secretion of oxytocin
- signal to anterior pituitary gland
- Conditions
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