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Mercurial biology text October 3, 2016

Posted by mareserinitatis in education, science, younger son.
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Younger son was reading through some biology homework when he suddenly pipes up, “Mom!  Did you know you need mercury in your blood?”

I was of course quite shocked at his proclamation because that just didn’t make any sense.  I asked him to read me the sentence.  It said something about how the blood’s pressure needs to remain at xx (where xx is some number I don’t remember) mmHg.  “And Hg is mercury!”

While I can see where he would get that impression, this instigated a long conversation about how we measure air pressure.  It also made me wonder why they don’t bother explaining units before they start using them. I suppose it may be because they don’t think like younger kids, who could easily read something into it that an adult would never have thought of.

I’m just glad he thought to mention it before he went and got a hold of some mercury.

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