Fluid Regulation System

How is fluid regulated in the body?

A person's body regulates fluid by balancing liquid intake and removing extra fluid. Thirst usually controls a personís rate of liquid intake, while urination removes most fluid, although people also lose fluid through sweating, breathing, or diarrhea. The hormone vasopressin, also called antidiuretic hormone, controls the fluid removal rate through urination. The hypothalamus, a small gland located at the base of the brain, produces vasopressin. The nearby pituitary gland stores the vasopressin and releases it into the bloodstream when the body has a low fluid level. Vasopressin signals the kidneys to absorb less fluid from the bloodstream, resulting in less urine. When the body has extra fluid, the pituitary gland releases smaller amounts of vasopressin, and sometimes none, so the kidneys remove more fluid from the bloodstream and produce more urine.

Source: NIDDK (NIH)1

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References

  1. Source: NIDDK (NIH): niddk.nih.gov/ health-information/ kidney-disease/ diabetes-insipidus

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