The rate of reabsorption of water in the kidney is increased when there is no sufficient amount of vasopressin. This leads to a medical condition known as diabetes insipidus.
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When there is no sufficient amount of vasopressin, the rate of reabsorption of water in the kidney is decreased. As a result excess amount of urine is excreted. This medical condition is known as diabetes insipidus. Frequent urination, increased thirst etc. are the symptoms of this condition.