Question

fill in the blank question
when the blood becomes too concentrated, is secreted by the posterior pituitary gland. it enters the blood and travels to the kidneys where it causes more water to be reabsorbed into the blood.

Explanation:

The hormone that is secreted by the posterior - pituitary gland when blood is too concentrated to cause more water reabsorption in the kidneys is antidiuretic hormone (ADH), also known as vasopressin.

Answer:

Antidiuretic hormone (ADH)