NATURE AND SCIENCE SPEAK ABOUT GOD

Nature and Science Speak about God ~ 124 ~ The heart is specially built for the immense job it has to do. Its walls are made up of very tough muscular fibres, and it is surrounded by a double membrane (the pericardium) containing a fluid that lubricates its continual movement. The beat of the heart takes place in two steps, as first the upper and then the lower half contracts. This enables each half of the heart to rest while the other is beating. Inside, the heart is divided into 4 chambers, two upper chambers called the auricles and two lower chambers called the ventricles. Blood always flows from the auricles to the ventricles, and this one-way traffic is maintained by umbrella-shaped valves which guard the openings between the two sets of chambers. Digestion: The digestive system can be looked upon as a factory where food is tasted by the tongue, then crushed by the teeth, moistened with saliva and finally, —after elaborate precautions to avoid shunting mistakes — is pushed through the gullet into the stomach, a chemical plant where the most astonishing changes occur. Here millions of cells, too small to be seen, produce a dozen highly complex chemicals which break up the food we