A patch of lining of the alimentary canal has an area of 6 cm²…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A patch of lining of the alimentary canal has an area of . It has goblet cells in each square millimetre. In a model, each goblet cell makes of mucus in an hour. One square centimetre is , and one nanolitre is .
- How many goblet cells are in the patch?
- How much mucus does the patch make in an hour, in nanolitres?
- How much mucus does it make in a day of , in microlitres? One microlitre is .
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The worked solution
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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. Area . cells in each . for each cell in an hour.
Plan. Change the unit of area. Count the cells. Multiply by the mucus from one cell. Change the units.
Step 1. Cells. . Cells: .
Step 2. One hour. . In nanolitres: .
Step 3. One day. . In microlitres: .
Answer: cells; ; .
Watch out. The mucus rate is a made up value to give the practice. Real rates depend on the organ and the state of the body.
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