What process happens in this region of the nephron?

The cells in the photograph are found in which region of the nephron?

Which of the following statements about the cells in the photograph are correct?

Deamination in the liver initially produces
The osmotic concentration of urine is controlled by ADH. In which part of the nephron does this occur?
During the formation of urine in the nephron most water is reabsorbed into the blood in the