What it teaches
The main organs and what each one does. One job each, said plainly — a child of seven does not need the circulatory system, they need to know that the heart moves the blood around and that this is why it beats faster when they run.
How it works
An organ is named and its jobs are the answers, or the other way round. Three levels change the length of the round and the number of answers.
What to look for
This one connects to things a child can feel: a pulse after running, breath on a cold morning. Those beat any picture on a screen, and the game is a way of naming what they have already noticed.