The Digestive System: The Stomach

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We continue our journey through the digestive system, we have already learnt about processes in inside the mouth and in the oesophagus.

human_digestive_systemThe Stomach

This is where our food now a bolus is exposed to hydrochloric acid produced by the stomach for further digestion. Our saliva is slightly alkaline, so why this change in pH? In this case not only does the acidity destroy potentially harmful microorganisms which could have been swallowed with our food but also different enzymes, which breakdown food, are more effective at different pH values.

The enzyme pepsin for example is produced in the stomach and works best at a low pH level, thriving in an acidic environment. Pepsin breaks down protein into smaller peptides, it is known as a protease enzyme because it does this process by hydrolysis of peptide bonds. The resulting product: peptides, short chains of amino acids (the basic building blocks of the human body and essential for a healthy body)…

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