At rest, 5000 mL of blood passes through the tissues 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.
At rest, mL of blood passes through the tissues in a minute. Each mL of this blood gives up mL of oxygen.
- How much oxygen is delivered in a minute?
- How much oxygen is delivered in an hour, in litres?
Need a reminder? The key ideaShow
About per cent of the oxygen travels on haemoglobin in the red blood cells, and about per cent is dissolved in plasma. One haemoglobin molecule carries at most oxygen molecules. Every mL of oxygenated blood delivers about mL of oxygen to the tissues.
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. Flow: mL a minute. Oxygen: mL for each mL.
Plan. Count the lots of mL, multiply by mL, then scale up to an hour.
Step 1. One minute. mL.
Step 2. One hour. mL, which is L.
Answer: mL a minute and L an hour.
Check. About mL a minute is a usual figure for the oxygen use of a resting adult.
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