The heart's whole structural vocabulary is a handful of roots — cardi/o, atri/o, ventricul/o, sept/o, valvul/o — wearing position prefixes. Snap the parts together below and watch the combining vowel appear or disappear, then read what you just built. Switch to Latin plurals when you want to practise turning atrium into atria and thrombus into thrombi.
Front part — a position prefix, or the root my/o
Root — the structure
Second root (optional)
Suffix
Give the plural
atrium
Type the plural exactly as it would appear in a chart.
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The wall, inside out
Working inward: the pericardium is the tough sac around everything, the epicardium hugs the outer surface, the myocardium is the thick contractile muscle and the endocardium is the smooth lining touching blood. One root, three prefixes, four structures.
Type a plural and press Check. The feedback names the rule, not just the answer — that is what transfers to the next word.