Circulation of the blood

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, she said:

‘Now, class, if I stood on my head, the blood, as you know, would run into it, and I would turn red in the face.’

‘Yes,’ the class said:

‘Then why is it that while I am standing upright in the ordinary position the blood doesn’t run into my feet?’

Little Johny shouted:
‘Cause your feet ain’t empty!

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