The following page was taken from a PSLE assessment book from a reputed publisher of school text books. Check out their summary of organs and their relationship with the circulatory system below:
Go through the lines and see if you can spot the mistake. This is what happens when you try to scratch the surface at a much higher level to make the lower level look impressive. You end up teaching the wrong thing. Teacher aiyiyo!
The answer is here.
© Chan Joon Yee