A blood donor gives 350 mL of blood. His blood has 14 g of haemoglobin in every 100 mL…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A blood donor gives mL of blood. His blood has g of haemoglobin in every mL.
- How much haemoglobin is in the donation?
- Another donor has g in every mL, and gives the same volume. How much haemoglobin is in her donation?
- How much more haemoglobin does the first donation hold?
Need a reminder? The key ideaShow
Blood is about plasma and formed elements. A healthy adult has to million red cells in each mm³. The blood holds to g of haemoglobin in each mL in a woman and to g in a man. There are to white cells in each mm³. One mL is mm³. The white cells, from most to least: neutrophils, lymphocytes, monocytes, eosinophils, basophils.
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. Donation: mL. Haemoglobin: g and g in each mL.
Plan. Divide the volume by mL, then multiply by the haemoglobin in one lot.
Step 1. The first donor. g.
Step 2. The second donor. g.
Step 3. The difference. g.
Answer: g; g; g.
Check. Each value is in the healthy range for the donor: g for a man ( to g) and g for a woman ( to g).
What if? A person with g in each mL would give g in the same volume.
Source. WHO (2024), guideline on haemoglobin cutoffs; OpenStax Anatomy and Physiology 2e, chapter 18.
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