The stomach is an amazing organ.

It varies in size from person to person but can contain up to 2 litres of food and liquid.

The stomach is one of the organs in the digestive system. It is essentially a bag of muscle where food is kept for up to 2 hours whilst various things happen to it.

There are two types of digestion that occur in the human body: mechanical and chemical. They both occur in the stomach.

The innermost tissue in the stomach is called the mucosa. This layer contains cells that secrete something called gastric juice into the stomach. It contains mucus, digestive enzymes and hydrochloric acid.

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