Separate macro- from micronutrients, give each of the ten named ions a job and a deficiency, work the sodium-potassium and sodium-glucose pumps, and match every heavy metal to its disease and its chelator.
Unit 2 carries 10 of the 50 chemistry marks; with three chapters sharing them, this one averages a little over three (MEC publishes weights by unit, not by chapter). It is the newest kind of chemistry MEC sets — inorganic chemistry pointed at medicine — and almost all of it is table work.
The MEC scope line: Concept of micro- and macronutrients; biological importance of Na, K, Mg, Zn, Cu, Co, Ni, Fe, Cr and Ca ions; sodium–potassium and sodium–glucose pumps; toxicity of iron, arsenic, mercury, lead and cadmium. Three ways it is asked:
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