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NNCO Certification in Clinical Nephrology Technology (CCNT) Practice Tests & Test Prep by Exam Edge


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NNCO Certification in Clinical Nephrology Technology Sample Test

1 of 5

Which of the following structures in the renal system propel the urine from the
kidneys to the urinary bladder?

Correct Answer:
ureter


the question asks which structure in the renal system helps in propelling urine from the kidneys to the urinary bladder. the correct answer is the ureter.

the renal system, also known as the urinary system, includes the kidneys, ureters, urinary bladder, and urethra. each of these parts has a specific function in the production, storage, and elimination of urine. the kidneys filter the blood to remove waste and excess substances, producing urine in the process. once the urine is formed in the kidneys, it needs to be transported to the urinary bladder where it is stored until it is excreted from the body through the urethra.

the ureters are a pair of muscular tubes that actively transport urine from the kidneys to the bladder. each kidney is connected to one ureter. the ureters originate from an area in the kidney called the renal pelvis, which collects the urine before it flows into the ureters. from the renal pelvis, the ureters run downward behind the peritoneum and enter the urinary bladder at an oblique angle. this anatomical arrangement helps prevent the backflow of urine from the bladder back into the ureters.

the propulsion of urine along the ureters is primarily achieved through peristalsis, which is a series of wave-like muscle contractions that move the urine down the tubes. the walls of the ureters are lined with smooth muscle, and their rhythmic contraction creates the peristaltic waves. additionally, the flow of urine is assisted by gravity and hydrostatic pressure generated from the continuous process of urine production by the kidneys.

in contrast, other structures listed in the options, such as the renal vein and the renal pelvis, serve different purposes. the renal vein carries cleansed blood away from the kidneys back to the heart, while the renal pelvis is simply a part of the kidney where urine collects before entering the ureters. the cortex, another option listed, refers to the outer part of the kidneys where blood filtration takes place, not a structure associated with the transport of urine to the bladder.

therefore, the ureter is the correct answer as it is specifically responsible for propelling urine from the kidneys to the urinary bladder.
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