Answer :
Final answer:
Mechanical digestion involves physical processes to break down food, primarily contributed by migrating motility complexes. Other options like pancreatic juices, pancreatic lipase, and bile mainly aid in chemical digestion. Therefore, migrating motility complexes are the correct choice among the options given.
Explanation:
Understanding Mechanical Digestion
Mechanical digestion refers to the physical processes that break down food into smaller pieces, making it easier for enzymes to further digest the food chemically. Among the options provided, the one that contributes to mechanical digestion is Migrating motility complexes.
Migrating motility complexes, also known as MMCs, are peristaltic movements in the gastrointestinal tract that occur between meals to help move food residue and promote mixing and digestion. They play a crucial role in ensuring that the digestive system functions properly by preventing the buildup of undigested food and stimulating further digestive activity.
On the other hand, pancreatic juices and pancreatic lipase are primarily involved in chemical digestion; pancreatic juices contain enzymes that chemically break down carbohydrates, fats, and proteins. Similarly, bile assists in the emulsification of fats, but it does not mechanically break down food.
In summary, while several options listed serve important roles in digestion, only migrating motility complexes directly contribute to the mechanical process of digestion.
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