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Arrange the following structures in the correct order based on changes in osmolarity relative to plasma respectively:
Bowman's capsule →Proximal Convoluted Tubule (PCT) →thin part of descending limb of the loop of Henle →thin part of ascending limb of the loop of Henle →Distal Convoluted Tubule (DCT) →End of collecting duct.
Isotonic → Isotonic → Hypotonic → Hypertonic → Hypotonic → Hypotonic
Isotonic → Isotonic → Hypertonic → Hypertonic → Hypotonic → Hypertonic
Isotonic → Hypertonic → Isotonic → Hypertonic → Hypotonic → Hypertonic
Hypotonic → Isotonic → Hypertonic → Isotonic → Hypotonic → Hypertonic
Answers (1)
The correct answer is option 2: "Isotonic → Isotonic → Hypertonic → Hypertonic → Hypotonic → Hypertonic," the sequence accurately represents the changes in osmolarity along these segments of the renal tubules.
Bowman's capsule and the Proximal Convoluted Tubule (PCT) start with an isotonic osmolarity, meaning their solute concentrations are similar to that of plasma.
As the filtrate progresses into the thin part of the descending limb of the loop of Henle, water is passively reabsorbed, resulting in a higher solute concentration and an increase in osmolarity, leading to a hypertonic environment.
In the thin part of the ascending limb of the loop of Henle, solutes are further transported out actively, maintaining a hypertonic osmolarity.
The Distal Convoluted Tubule (DCT) maintains an isotonic osmolarity similar to that of plasma.
Lastly, in the End of collecting duct, solutes are reabsorbed, resulting in a decrease in osmolarity and a transition to a hypotonic environment.
Hence, the correct answer is option 2.
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