How many holes does a straw have?

[chimp3]

Aha.

But a hole is an interrupted surface.  A straw is a rhombus, which means from any point on a straw, you can travel along the surface to reach any other point.

So The human body doesn't have any holes, technically speaking?

I had an MD explain to me that the human G.I. tract is a hollow tube through the body but not considered to be the inside of our body. If something is swallowed, such as poison or food, it is still outside our body until it enters the bloodstream.