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In order to illustrate the function and purpose of the blood circulation, let us for a moment consider the mail train travelling from Basel to Lugano and back, making scheduled stops to unload on the way to Lugano and picking up mail on the way back to Basel. Imagine the confusion if the train did not keep to its timetable. At each station we can see the postmaster impatiently pacing up and down the platform looking for the train to arrive and trying to calm down the people who are waiting for their mail. Such a relatively small mix-up in the commercial world could trigger undesirable delays and upset everyone.

We can draw an analogy between the mail train and the circulatory system. Let us compare the outward-bound train on its way to Lugano with the arterial network, which has the job of supplying the millions of body cells with nourishment so that they are able to perform their functions. All the necessary minerals, vitamins, enzymes, amino acids for the manufacture of protein, all the sugars and fats, and even oxygen are being transported via the arterial network on a strict schedule, every day, every hour.

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