Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair. Your body has about 5.6 liters (6 quarts) of blood. This 5.6 liters of blood ...

Find out about the different stages of a human life cycle and how we change ... circulatory system takes oxygen around the body. What is in your blood? Discover how blood vessels and blood cells ...

CD163 might not be the most exciting name in the world, but behind it lies one of the body's most important defense receptors, which steps in when red blood cells ... of human CD163 bound to ...