When blood volume & pressure are too low, the pituitary gland releases this hormone which increases water reabsorption from filtrate into blood, thus conserving body water and producing a highly concentrated urine.

Anti diuretic hormone.

Explanation:

Anti diuretic hormone (ADH) also known as vasopressin is a polypeptide hormone released from the pituitary gland. This hormone is involved in the sexual motivation and social behavior of the organism.

ADH is released in case of low blood pressure and blood volume. This hormone helps in the conservation of body water and also constricts the arteriole. This increases the blood pressure, blood volume and maintains the homeostasis of the body.

Thus, the answer is anti diuretic hormone.

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