Q: What organs need constant pressure to filter the blood?


Read this paragraph and choose the correct option from the provided answers:

The kidneys also need constant pressure to filter the blood. When the blood pressure drops too low, the kidneys increase the pressure. One way is by producing angiotensin, a blood vessel-constricting protein. This protein also signals the body to retain sodium and water. Together, the constriction of blood vessels and retention of sodium and water help restore normal blood pressure.

 Choices:

- lungs

- dialysis

- arteries

- kidneys


A:
kidneys