How Physiological Parameters are Controlled?
Controlling physiological parameters is similar to how we control bicycles.
Riding a Bicycle
The basic requirement of riding a bicycle is keeping balance.
However, we don't keep it perfectly up at all times.
We need to tilt it as needed to take turns.
However, this tilting should be limited. Too much-tilting results in a fall and we get injured.
Controlling Physiological Parameter
Physiological parameters are maintained in an optimal range.
However, they are not kept at a fixed level.
They are adjusted as per the changes in the body's needs. That is, they increase or decrease as needed.
However, this increase or decrease should be limited. Too much increase or decrease can lead to disease or death.
For Example, Blood Pressure
Blood pressure is maintained at around 120/80 mmHg.
However, this value is not fixed.
It increases or decreases as per changing needs of the body. For example, during exercise, it rises and under the resting conditions, it decreases.
Too much increase beyond the body's need produces adverse consequences of hypertension and too much decrease produces consequences of hypotension.
The balancing of physiological parameters is done by the negative feedback control mechanism.