Certified Clinical Hemodialysis Technician (CCHT) Practice Exam 2025 - Free CCHT Practice Questions and Study Guide

The renal pelvis is not one of the four parts of the tubular structure of the kidney; rather, it is an area that collects urine before it flows into the ureter. The main tubular structures of the kidney include the proximal convoluted tubule, loop of Henle, and distal convoluted tubule. These tubules are crucial for the filtration and reabsorption processes that take place within the nephron, which is the functional unit of the kidney.

The proximal convoluted tubule is responsible for reabsorbing much of the water, ions, and nutrients from the filtrate. The loop of Henle plays a critical role in concentrating urine and maintaining the body's water balance through its descending and ascending limbs. The distal convoluted tubule further fine-tunes the composition of the filtrate and is involved in the regulation of potassium and sodium through hormonal influence.

In contrast, the renal pelvis does not engage in these filtration and reabsorption functions, underscoring why it is not counted among the parts of the tubular structure within the kidney.