A 76-yeаr-оld wоmаn is аdmitted tо the hospital with severe dehydration after two days of vomiting and poor fluid intake. Her blood pressure is low, her mouth is dry, and her urine appears as shown in the image. Her posterior pituitary releases increased antidiuretic hormone (ADH) to help conserve body water. What happens to her urine volume in response to increased ADH?