Your circulatory system works all day, every day, to pump oxygen throughout your body. There are cardiovascular conditions that can impact this system. Your circulatory system, also known as your ...

Find your added subjects in My Bitesize. All living things are made of cells which are differentiated to perform different functions. Substances move into or out of the cell and enzymes are catalysts ...

For centuries, scientists believed the human body had two major circulation systems. One was the cardiovascular system that moves blood through arteries and veins. The other was the lymphatic system ...