The circulatory ... blood from the heart, delivers oxygen and nutrients to the body's cells and then returns deoxygenated blood back to the heart. The system of blood vessels in the human body ...

So how does blood flow through the heart ... of blood vessels called the circulatory system. The vessels are elastic tubes that carry blood to every part of the body. Blood is essential.

Share on Pinterest Grisha Bruev/Shutterstock Poor circulation ... which your body converts into nitric oxide. Nitric oxide relaxes blood vessels and increases blood flow to muscle tissue.

Your circulation is now complete. Oxygen-rich blood can flow from your heart to the rest ... This short film is from the BBC series, Inside the Human Body. This short film could be used either ...