A boy at rest breathes 14 times in a minute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A boy at rest breathes times in a minute. Each breath moves mL of air.
- How much air does he move in one minute?
- How much air does he move in minutes?
Need a reminder? The key ideaShow
In inspiration the diaphragm and the external intercostal muscles contract, the volume of the chest rises and the pressure in the lungs falls below atmospheric pressure. In expiration they relax and the pressure rises slightly above atmospheric pressure. Air moved in a minute rate volume of each breath.
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. Rate: breaths a minute. Volume of a breath: mL.
Plan. Air in a minute is the rate times the volume of a breath.
Step 1. One minute. mL.
Step 2. Five minutes. mL.
Answer: mL in one minute and mL in five minutes.
Check. mL is in the usual range of to mL a minute.
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