The kidneys of a healthy adult filter 180 L of fluid in a day…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The kidneys of a healthy adult filter 180 L of fluid in a day. The share that is reabsorbed depends on ADH.
- With ADH at work, is reabsorbed. How much urine forms in a day?
- With less ADH, is reabsorbed. How much urine forms?
- With no ADH in a model of diabetes insipidus, is reabsorbed. How much urine forms?
- How many times more urine is made in (c) than in (a)?
Need a reminder? The key ideaShow
Pars distalis: GH, PRL, TSH, ACTH, LH, FSH. Pars intermedia: MSH. Pars nervosa: oxytocin and vasopressin (ADH). The kidneys filter 180 L of fluid in a day. ADH makes the distal tubules reabsorb more water, so the urine is less in volume and more concentrated.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Filtrate: L in a day.
Plan. Urine is the part of the filtrate that is not taken back.
Step 1. . Not taken back: . L.
Step 2. . Not taken back: . L.
Step 3. . Not taken back: . L.
Step 4. The ratio. times.
Answer: L; L; L; times.
Check. Less ADH means less water taken back, so more urine and a more dilute urine.
Watch out. These shares are a model that shows the idea. NCERT gives the filtrate of L a day and a urine volume of about to L.
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