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. Mastication: Mastication is the mechanical chewing of food that occurs in the mouth to break food into smaller pieces -not related to bile emulsifying fats.
B. Peristalsis: Peristalsis are wave-like smooth muscle contractions that propel contents through the GI tract -helps move chyme but does not chemically/physically disperse fat droplets like bile does.
C. Emulsification: Emulsification is the process by which bile salts surround and break large fat globules into many small droplets, increasing surface area for lipase action.
D. Deglutition: Deglutition is the act of swallowing, moving a bolus from the mouth into the pharynx and esophagus -not the process of bile acting on lipids.
Correct Answer is D
Explanation
A. Bulbourethral gland: Bulbourethral (Cowper’s) glands produce a clear mucous pre-ejaculate that lubricates the urethra and can neutralize small amounts of urine but do not produce the milky, nutrient-rich fluid described.
B. Skene's gland: Skene’s glands are female periurethral glands (not male) and are not involved in semen production.
C. Bartholin's gland: Bartholin’s glands are female vestibular glands producing lubrication during arousal -not involved in male semen.
D. Prostate gland: The prostate secretes a slightly alkaline, milky fluid that nourishes/protects sperm and helps neutralize the acidic vaginal environment .
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