Category Archives: HOW?
168.HOW DOES THE BODY MAKE BLOOD CELLS?
In the body of an adult human being, there are about six litres of blood. Floating about in this liquid there are approximately 25 billion blood cells!
It is almost impossible for us to imagine such a tremendous quantity, but this might give you an idea. Each blood cell is so tiny that it can only be seen under a microscope. If you could make a string of these microscopic cells, that string would go four times around the earth!
167.HOW DO OUR KIDNEYS FUNCTION?
The kidneys, two flat, bean-shaped, solid organs, are among the most important in our body. About 10 centimeters, they lie on each side of the spine near the waistline.
The kidneys remove unwanted substances from the body. It is just as important for the body to get rid of what it doesn’t need and can’t use as it is for it to take in what it needs. They also regulate the amount of water and other substances in the blood.
166.HOW DO ARTERIES DIFFER FROM VEINS?
There is no transportation system in any city that can compare in efficiency with the circulatory system of the body.
If you will imagine two systems of pipes, one large and one small, both meeting at a central pumping station, you’ll have an idea of the circulatory system. The smaller system of pipes goes from the heart to the lungs and back. The larger one goes from the heart to the various other parts of the body.
