The lumen of a hollow organ such as the stomach is considered to be part of the ________ environment.
A) internal
B) external

Question

Quizplus · Accepted Answer

The lumen of a hollow organ like the stomach is considered part of the external environment because it is continuous with the outside world through openings (e.g., mouth, anus), and substances within it have not yet crossed a cell membrane to enter the body's internal environment.

The Lumen of a Hollow Organ Such as the Stomach