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Homeostasis

Homeostasis and hormonal action

QuestionAnswer
What is homeostasis ? The maintenance of a constant state in the internal environment of organisms. It is the ability to return to a set point (normal range) so organisms can maintain balanced equilibrium.
Set point the desired level at which the system operates. This is monitored by the receptor.
Receptor detects internal and external stimuli which indicate any deviation from the set point and informs the central control
Central control coordinates information from various sources and sends instructions to a suitable effector
Effector often a muscle or gland that brings about the necessary change needed to return the system to the set point. This return creates a feedback loop.
Feedback loop informs the receptor of the changes to the system brought about by the effector
Negative feedback the response reduces the initial stimulus and decreases the hormone signalling. The signal pathway is 'turned off' and is not continuously active.
Positive feedback the response increases the initial stimulus and increases hormone signalling so that the response becomes more intense.
Any change to the system is considered an Stimulus
This component measures the level of a factor receptor(sensor)
This component stored operational information and coordinates effectors control center
This component brings about changes to the system in order to return it to the set point effector
Created by: ServAP
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