Homeostasis and Feedback

HOMEOSTASIS: is the maintenance of a constant internal environment despite external changes. 

Living organisms have a number of conditions to maintain;

• body tempreature
• blood glucose concentrations
• blood salt concentration
• water potential of the blood 
• blood pressure
• carbon dioxide concentration

Negative Feedback:

In order to maintain a constant internal environment a number of processes must occur;

• any change to the internal environent must be detected 
• the change must be signalled to other cells
• there must be a response that reverses the change

NEGATIVE FEEDBACK:is a process which brings about a reversal of any change in conditions   to optimum conditions

STIMULUS--RECEPTOR--CELL SIGNALLING--EFFECTOR--RESPONSE

There are a number of structures required for this pathway to work;

• SENSORY RECEPTORS: eg; tempreature or glucose concentrations receptors. These…