Question

The list shows five processes that occur during digestion.

1. Tearing
II. Grinding
III. Mixing
IV. Churning
V. Rolling
Where do these processes most likely occur?
A
in the mouth
B
in the esophagus
С
in the stomach
D
in the colon

Answer 1

Tearing, grinding, mixing, churning, and rolling are mechanical digestion processes that predominantly occur in the stomach, where the food is physically broken down by muscular actions.

Step-by-step explanation:

The mechanical digestion processes listed: tearing, grinding, mixing, churning, and rolling, most likely occur in the stomach (Option C). This is because the stomach is known for its muscular contractions that physically break down food into smaller pieces, increasing surface area and mixing it with digestive juices to form a substance known as chyme. The processes of grinding and churning are particularly characteristic of stomach activity. Moreover, saliva in the mouth begins the process of chemical digestion, albeit some mechanical digestion such as tearing and grinding occurs here too, as the teeth chew food. However, the intensive activities of mixing, churning, and rolling, are specific to the stomach's functions.