Which of the following structures occurs exclusively in the renal medulla? (a) renal sinus, (b) renal pyramids, (c) major calyces, (d) minor calyces.
The kidneys are the bean-shaped organ that is present below the rib cage. It is responsible for eliminating waste and excess fluid from the body. The kidneys also clear out acid formed and maintain the balance of water, salts, and minerals.
The renal pyramids are the primary structures that are located inside the renal medulla, and they're pyramid-shaped. Every pyramid's apex faces the kidney's center and is attached to urine-collecting tubules. The nephrons in this organ are responsible for regulating the blood's salt and water balance.
Hence, the correct option is b.
Option a is incorrect because the renal sinus is part of the renal tubule. It contains the renal calyces, renal pelvis, vessels, nerves, and lymphatics.
Option c is incorrect because cuplike collection chambers help collect urine from minor calyces in the renal medulla.
Option d is incorrect because minor calyces are the tube-like structure that conducts urine from the renal pelvis to the urinary bladder.
Hence, the renal pyramids are the renal medulla's inner structure that helps regulate the blood's salt and water balance in the human body.