"A lesson about blood flow and circulation" joke

A teacher was giving a lesson on the circulation of the blood. Trying to make the matter clearer, he said: "Now, students, if I stood on my head the blood, as you know, would run into it, and I should turn red in the face."

"Yes, sir," the boys said.

"Then why is it that while I am standing upright in the ordinary position the blood doesn`t run into my feet?"

A little fellow shouted, "`It`s because yer feet ain`t empty."

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