Which statement accurately describes the lumen of a hollow organ?

Which statement accurately describes the lumen of a hollow organ?

• A. It is the outer surface of the organ.
• B. It is the central connective tissue layer.
• C. It is the interior space enclosed by the organ walls.
• D. It is the organ's nerve supply.

Answer: (C)

Lumen is the interior space enclosed by the walls of a hollow organ. It’s the central cavity through which contents pass, such as food and liquid in the stomach or urine in the bladder, and it is surrounded by the organ’s wall layers. The outer surface refers to the serosa or adventitia, the wall’s boundary; the central connective tissue layer is the submucosa, which is part of the wall structure; and the nerve supply consists of the nerves that innervate the organ. The lumen, by contrast, is the hollow interior space inside the organ walls.

Lumen is the interior space enclosed by the walls of a hollow organ. It’s the central cavity through which contents pass, such as food and liquid in the stomach or urine in the bladder, and it is surrounded by the organ’s wall layers. The outer surface refers to the serosa or adventitia, the wall’s boundary; the central connective tissue layer is the submucosa, which is part of the wall structure; and the nerve supply consists of the nerves that innervate the organ. The lumen, by contrast, is the hollow interior space inside the organ walls.