So it's a good job we've got the circulatory system to transport nutrients, water and oxygen to the entire body. If we could join all the blood vessels in a human body together end-to-end ...

The human gut is home to trillions of microbes that not only aid in digestion, but also play a key role in shaping our immune ...

Your heart's will to beat, to keep going, is incredibly strong. If the heart fails, so does everything else… Because it's your heart's job to deliver to every cell, to every nook and cranny of ...

Human blood is a complex mixture containing: Red blood cells which carry oxygen throughout the body, white blood cells are part of the immune system, platelets which are essential for blood ...