Which structure in the nephron is primarily responsible for reabsorption?
Proximal convoluted tubule
Efferent arteriole
Afferent arteriole
Loop of Henle
The Correct Answer is A
A. Proximal convoluted tubule: The PCT reabsorbs the majority of filtered water and solutes (≈65% Na⁺/H₂O, all filtered glucose and amino acids, many ions).
B. Efferent arteriole: An efferent arteriole is a blood vessel leaving the glomerulus (carries blood), not a tubular segment that reabsorbs filtrate.
C. Afferent arteriole: Afferent arteriole supplies blood to the glomerulus; it is not involved in tubular reabsorption.
D. Loop of Henle: The loop helps concentrate urine (water reabsorption in the descending limb, ion transport in the ascending limb) but the PCT is the primary site for bulk reabsorption.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Responsible for uterine contractions: The myometrium is the thick middle layer of uterine smooth muscle and is the contractile layer responsible for rhythmic uterine contractions (e.g., labor, Braxton–Hicks) .
B. Primary support for the uterus: Structural support of the uterus is provided mainly by pelvic ligaments and pelvic floor muscles; this is not the primary role of the myometrium.
C. Thickens in response to estrogen: The endometrium (the mucosal lining) thickens cyclically in response to estrogen; the myometrium undergoes hypertrophy in pregnancy but is not the layer described by cyclic thickening of the uterine lining.
D. Covers the exterior portion of the uterus: The outer covering of the uterus is the perimetrium (serosa), not the myometrium.
Correct Answer is B
Explanation
A. DCT:A tubular (urine) segment, not a blood vessel.
B. Efferent arteriole:Carries blood away from the glomerulus after filtration.
C. Collecting duct:Urine pathway, not for blood.
D. Loop of Henle:Part of the nephron tubule for filtrate, not a vessel.
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