Imagine a digestive system where food entered the small intestine directly without first going through the oral cavity and stomach. What would be the disadvantages of this type of digestive system

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If the food enters the small intestine directly without first going through the oral cavity and stomach, following steps of digestion will be missed:

• Partial Digestion of starch in the oral cavity by the action of salivary amylase.
• Small amount of pepsin digestion in the stomach by the action of pepsin. The stomach stores and mixes the food received from the oesophagus with the gastric juice.

Both oral cavity and stomach play an important role in digestion of food. If the food directly enters into small intestine, it will take much more time for digestion as the digestion, which happens in mouth and stomach would not have happened. Also, starch digestion would be hampered.

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