THE MARVELLOUS DESIGN OF THE CIRCULATORY SYSTEM 2
The circulation of the blood between the heart and the lungs and back to the heart again takes about six or seven seconds. The circulation through the heart, which supplies the myocardium by way of the coronary vessels, takes place in about three or four seconds. The supply of blood to the brain takes eight seconds and to the tip of the toes, about eighteen seconds. One blood cell can make about 3,000 round trips in the course of a day. The cells are moving about incessantly, day and night. It seems that nothing in the world is more fond of travelling than our blood cells. Beginning at the heart, a cell reaches the loop of the capillaries with a swift motion. The further away it gets, the slower the motion becomes because of the thinner vessels. At last it delivers its load, as an express messenger would do, and begins immediately its return trip through the venous system. Physical stress, cold weather, excitement and fever make the blood cell speed up its pace. On the other hand, depression and psychological upsets cause it to slow down. In these situations, billions of cells receive inadequate nourishment and illness may result if the situation is not remedied by means of a positive psychological influence on the individual. This goes to show that depression and similar psychological problems may lead to physical illness if they continue for any length of time.
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