Homeostasis is
The process of maintaining a constant internal environment despite the external changes
This means your body doesn't care if it's -30 outside, it is still gonna do everything it can to be at 37 degrees
It does this by the FEEDBACK LOOP......
Stimulus is the environmental change
Sensor senses this change
Integrator compares the current condition with the ideal condition (the control centre, a.k.a your brain)
Effector is the system returning the system to the desired point
Response Is the effector's action: the system returned to the desired point
EXAMPLES
It's cold outside and your body temperature decreases to 36 degrees (sensor triggers this message to the brain). Your brain turns on the heating system. Your skin vessels constrict, you shiver, and there is less blood flow. Your body temperature now increases to 37 degrees.