Proof The Bible Is True

Ever had a blood test? Along with a value measured, there are also the normal max/min limits for that value. This implies that the body normally controls that quantity between those limits. How does it do that?

It measures the value and produces more or less of that quantity based on the value measured. This is called a control loop. There are hundreds of thousands, perhaps millions, of control loops in the human body.
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Source: icr.org