A person passes 1.5 L of urine in a day, and the urine holds 28 g of urea…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A person passes L of urine in a day, and the urine holds g of urea. Urea has a mass of u and two nitrogen atoms of u each.
- How many grams of urea are in each litre of the urine?
- How many grams of nitrogen are in the urea of the day?
- How many grams of urea are excreted in each hour, on average?
Need a reminder? The key ideaShow
Urine runs from the kidney down the ureter to the bladder. When the bladder is stretched, stretch receptors send signals to the CNS. The CNS sends motor messages: the bladder muscle contracts and the urethral sphincter relaxes. This is micturition. An adult passes to L of urine a day, slightly acidic (pH about ), with to g of urea. Glucose in the urine is glycosuria, and ketone bodies are ketonuria. Both point to diabetes mellitus.
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. Urine: L. Urea: g. Urea: u, with u of nitrogen.
Plan. Divide by the volume and the hours. Use the nitrogen share for the nitrogen.
Step 1. In each litre. g in each litre.
Step 2. Nitrogen. g.
Step 3. In each hour. g an hour.
Answer: g in each litre; g of nitrogen; g an hour.
Check. g is in the NCERT range of to g of urea a day.
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