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Inside the Human Body - The Respiratory System

 

My blood travels through tubes that we call blood vessels. Some of them are big enough that I can even see them under my skin. Look at your wrist. The blue coloured tubes you see just under your skin are tubes full of blood. They are called veins!

Most of my blood tubes are very tiny and we would need a microscope to see them. Why is everything in my body so small?

  

Canada's Digital Collections Watermark This digital collection was produced under contract to Canada's Digital Collections program, Industry Canada. The web site was produced by a youth team at the Saskatchewan Lung Association.