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When we ingest large molecules, they must undergo several processes before they may be completely digested. One of these processes uses both skeletal and smooth muscle contractions. This is called mechanical digestion (option D)
Digestion is the process by which food
molecules is broken down into smaller particles.
This also takes two forms one of which is chemical digestion and the other: mechanical digestion.
Mechanical digestion involves the physical aspect of digestion which may include churning in the mouth, contraction of the smooth muscle etc.
All this is to break the food down into smaller particles. Chemical digestion is done with the aid of enzymes to help break large food particles down
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