Most of the cells in your body are epithelia – that is, most of them are part of

Question

Most of the cells in your body are epithelia – that is, most of them are part of a vast, varied, continuous sheet of cells that faces the outside world. But we have a complex, highly-infolded body plan that can make it hard to tell when an organ or tissue actually does face the outside of our organism. Which of the following locations in your body is (or are) lined with epithelial cells and thus constitutes, topologically, part of the outside world?

A. The lumen of your small intestine
B. The inside of your bladder
C. The air sacs (alveoli) deep in your lungs
D. The lumen of your blood vessels
E. The lumen of your esophagus


[Hint: Please type your answer with comma-seperated values (in any order). For example, if the answer is A and E, "A,E", "E,A", "A, E", or "E, A" is acceptable.]

Explanation / Answer

"A, B, C, E"

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