The combining forms of the name (chlor- + hydr-), referring to chlorine and hydrogen, are the same as those in the name of hydrochloric acid, which is the active constituent of gastric acid.
In humans, the normal pH is around 1 to 3, which varies throughout the day.
The highest basal secretion levels are in the late evening (around 12 A.M. to 3 A.M.).
[3] Hypercalcemia also increases gastrin and gastric acid and can cause ulcers.
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