Question

1. in which structure listed below would mechanical digestion take place?

a. rectum
b. colon
c. duodenum
d. jejunum
e none of these are correct

Explanation:

Mechanical digestion involves physical breakdown of food. The rectum stores feces. The colon absorbs water and electrolytes. The duodenum and jejunum are mainly for chemical digestion (enzymes act on food). Mechanical digestion occurs in mouth (chewing) and stomach (churning). Since none of the given options (rectum, colon, duodenum, jejunum) are sites of mechanical digestion.

Answer:

E. none of these are correct