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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. 70–80%:This range is typical for newborns/infants, not average adults.
B. 10–20%:Far too low -corresponds to extreme dehydration or measurement error; not normal.
C. 30–40%:Lower than typical adult values; may be seen in elderly people with high fat mass.
D. 50–60%:Average adult total body water is roughly 50–60% of body weight (higher in lean males, lower in females/older adults).
Correct Answer is A
Explanation
A. Regulating body temperature of the testes:Correct -the scrotum suspends the testes and adjusts their position to keep testicular temperature slightly below core body temperature, which is necessary for optimal sperm production.
B. Storing urine:Incorrect -urine is stored in the urinary bladder, not in the scrotum.
C. Producing sperm: Incorrect -sperm are produced in the seminiferous tubules inside the testes; the scrotum is a protective/powerful thermoregulatory sac, not the sperm-producing tissue.
D. Carrying sperm to the urethra: Incorrect -ducts such as the vas (ductus) deferens carry sperm toward the urethra; the scrotum does not transport sperm.
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