A nurse is caring for a client with impaired renal function and is reviewing the processes involved in urine formation. Which of the following statements best describes the process of tubular secretion in the nephron?
Tubular secretion involves the reabsorption of substances from the renal tubules into the peritubular capillaries.
Tubular secretion is a passive process that occurs in the glomerulus, allowing the filtration of waste products.
Tubular secretion is the movement of substances from the blood in the peritubular capillaries into the renal tubules.
Tubular secretion primarily occurs in the Bowman's capsule, facilitating the selective reabsorption of essential nutrients.
The Correct Answer is C
A. Tubular secretion involves the reabsorption of substances from the renal tubules into the peritubular capillaries.: That describes reabsorption, the opposite of secretion.
B. Tubular secretion is a passive process that occurs in the glomerulus, allowing the filtration of waste products.: Filtration in the glomerulus is a separate, largely passive process; tubular secretion is an active transport process occurring in the renal tubules.
C. Tubular secretion is the movement of substances from the blood in the peritubular capillaries into the renal tubules.: This correctly describes tubular secretion (e.g., H⁺, K⁺, drugs) .
D. Tubular secretion primarily occurs in the Bowman's capsule, facilitating the selective reabsorption of essential nutrients.: Bowman's capsule is the site of filtration, not tubular secretion; selective reabsorption occurs later in the tubules.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Loop of Henle: The Loop of Henle is the U-shaped segment of the nephron that extends into the medulla and concentrates urine.
B. Proximal Convoluted Tubule: The PCT is the first convoluted segment after Bowman's capsule and is responsible for bulk reabsorption of solutes and water.
C. Bowman's Capsule: Bowman's capsule is the double-walled cup that surrounds the glomerular capillary tuft and collects filtrate.
D. Glomerulus: The glomerulus is the capillary tuft inside Bowman's capsule that performs plasma filtration.
E. Collecting Duct: The collecting duct collects filtrate from multiple nephrons and participates in final water/solute adjustments.
Correct Answer is B
Explanation
A. Urea: Urea is the major nitrogenous waste normally present in urine.
B. Albumin:Albumin in urine (albuminuria/proteinuria) is abnormal and suggests glomerular damage or increased filtration of plasma proteins.
C. Sodium: Sodium is a normal urinary electrolyte whose excretion varies with intake and hormonal control.
D. Creatinine:Creatinine is a normal waste product excreted in urine and used clinically to assess renal function.
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