SHolroydAtWeilCornellMedQatar/Urology/Kidney/Tubules/WaterReabsorption/EffectOfDecrease

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2020年3月31日 (火) 10:14時点におけるAdmin (トーク | 投稿記録)による版
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POINT!

narrated video explanation

WaterReabsorptionBaseLine-Eng.jpg

Prior to the water reabsorption from the tubule decreasing (at baseline), we will make the assumption that the subject is in homeostasis with normal plasma and urine osmolarities (isotonic) and urine volume.

WaterReabsorptionEffectOfDecrease-2Eng.jpg

Step 1: Suppose that the water reabsorption from the tubule decreases.

WaterReabsorptionEffectOfDecrease-3Eng.jpg

Step 2: With the decrease in water reabsorption, concentrated (hypertonic) solution enters the plasma. This increases plasma osmolarity (concentrated, hypertonic). Because concentrated (hypertonic) solution leaves the tubule due to reabsorption, the fluid remaining in the tubule has an decreased osmolarity (diluted, hypotonic). Also, with the decrease in water reabsorption, there is more water remaining in the tubule. Overall, the urine becomes diluted and increases in volume.

Challenge Quiz

1.

With a decrease in the water reabsorption from the tubule, urine volume increases decreases .

2.

With a decrease in the water reabsorption from the tubule, urine osmolarity increases decreases .

3.

With a decrease in the water reabsorption from the tubule, plasma osmolarity increases decreases .