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Question:

Which of the following hormones is not increased in plasma during dehydration?

A Erythropoietin
explanation

During dehydration, secretions of antidiuretic hormone, renin, and aldosterone are increased in order to prevent further loss of water in the urine. Erythropoietin is produced in the kidney in response to low levels of oxygen (hypoxia) in order to stimulate production of red blood cells.