The lungs of a resting person breathe out 200 mL of carbon dioxide every minute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The lungs of a resting person breathe out mL of carbon dioxide every minute.
- How many litres is that in an hour?
- How many litres is that in a day?
Need a reminder? The key ideaShow
The lungs remove CO at about mL a minute, and water. The liver removes bile pigments, cholesterol, steroids, vitamins and drugs in the bile. Sweat has water, NaCl, a little urea and lactic acid, and it cools the body. Sebum has sterols, hydrocarbons and waxes. Saliva has small amounts of nitrogenous wastes. The water gained in a day equals the water lost: the urine is the part that the kidneys adjust.
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. mL of CO each minute.
Plan. Multiply by the minutes, then change to litres.
Step 1. One hour. mL L.
Step 2. One day. mL L.
Answer: L; L.
Check. The answers are in the ratio , as the hours are.
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