Homeostatic Control Systems PDF

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Notes on the Homeostatic control systems....

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Homeostatic Control Systems: In order to maintain homeostasis a control system must be in place within the organism. The control system should be able to detect deviations from normal to the Internal environment using receptors to do this. Then the system must be capable of making appropriate adjustments in order to restore factor to the desired value. There are two different types of control mechanisms: Intrinsic controls- local controls that are inherent in an organ. Extrinsic controls- are regulatory mechanisms that are initiated from outside of the organ. A tissue is a group of cells working together to carry out a specialised function. An Organ consists of two or more types of primary tissues working together to perform specialised functions. These two mechanisms are accompanied by the nervous and endocrine systems to help maintain an constant internal environment, to achieve homeostasis. An example of a homeostatic control system is a Feedback system. These responses are usually made after a change has been detected by the system. Positive feedback reinforces and encourages change e.g. the propagation of an action potential in a neuron. Negative feedback, on the other hand opposes change and this usually is linked to the Control of bodily temperature. Disruption in Homeostasis can occur and this leads to pathophysiology. Pathophysiology- is the abnormal functioning of the body that is associated with disease or injury.

e.g. a haemorrhage, blood loss the body compensates in order to maintain the blood pressure and circulation, if the wound is not closed death will occur....