Question

involuntary muscle contractions which move a bolus through the gastrointestinal tract are called ______
multiple choice

masticaton

chyme

peristalsis

defecation

Explanation:

• Mastication: It is the process of chewing, which is voluntary muscle action in the mouth, not related to moving a bolus through the GI tract.
• Chyme: It is the semi - liquid mixture of food and gastric juices in the stomach, not a muscle contraction.
• Peristalsis: It is the wave - like, involuntary muscle contractions that propel food (in the form of a bolus) through the gastrointestinal tract.
• Defecation: It is the elimination of feces from the body, the final stage of the digestive process, not the movement of a bolus through the tract.

Answer:

C. peristalsis