It's always construction season for the body

 


Like a car racing along the interstate, exiting onto a highway, and finally reaching the family farm along a dusty gravel road, our blood circulates inside our bodies. There are the major blood vessels, such as the aorta running out of the heart and there are the tiny capillaries allowing blood cells, one at a time, to carry oxygen and nutrients to all the cells in our bodies. The network of capillaries is so complex it is estimated there are over 40 billion in one person and, if stretched out in a single line, they would cover over 100,000 miles. 

Our blood is made up of a mix of liquids...



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