The propulsion by peristalsis best defines alternating waves of smooth muscle contractions that move food through the alimentary canal. Thus, the correct option is A.
What is smooth muscle contraction?
Smooth muscle contraction may be defined as a process that is caused by the skating of myosin and actin filaments over each other. This is facilitated by the hydrolysis of ATP.
Peristalsis may be defined as a sequence of wave-like muscle contractions that facilitates the movement of consumed food through the digestive tract.
This is implemented by the propulsion of peristalsis but not by the chemical digestion by peristalsis.
The appearance of peristalsis is initiated in the esophagus at which the strong wave-like movement of the smooth muscles allows the swallowed food to migrate into the stomach.
Therefore, the propulsion by peristalsis best defines alternating waves of smooth muscle contractions that move food through the alimentary canal. Thus, the correct option is A.
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