The coordinated contraction and relaxation of the walls of the food pipe is…

Concept

Peristalsis is an involuntary, wave-like pattern produced by coordinated contraction and relaxation of muscles in the wall of the alimentary canal.

The contraction behind a food bolus and relaxation ahead of it move the bolus forward through the digestive tract.

Application

In the food pipe, this coordinated muscular wave pushes swallowed food towards the stomach. Therefore, the movement described in the question is peristaltic movement.

Contrast

• Translocation is the transport of organic nutrients, mainly through phloem, from source regions to sink regions in a plant.

• Transpiration is the loss of water vapour from the aerial parts of a plant, chiefly through stomata.

• Peristaltic movement is the coordinated contraction-and-relaxation wave that propels a food bolus through the food pipe.

• More than one of the above would require at least two listed terms to name this movement; the three named terms describe distinct biological mechanisms.

• None of the above would require every listed term to be unrelated to the movement; peristaltic movement names it directly.

Cross-check

The same mechanism explains why food can continue moving through the food pipe even when body position changes: muscular waves, rather than gravity alone, propel it.

Result: peristaltic movement.