The kidneys perform several important functions in the human body. One of these is to regulate the amount of water that makes up the liquid part of blood. If too much water is present, the kidney will increase the amount of urine produced and lower the amount of liquid water in the blood. If the amount of water is too low, the kidney will decrease the amount of urine produced in order to conserve water. A person spends several days in a hot, dry desert environment with little water available to drink. Which statement does BEST summarize how the kidneys will function during this time?