PRESENTER:It's the key organ in your circulatory system, and it keeps the blood flowing around your body. PRESENTER:'The ... now travels back to the heart and the whole cycle begins again.' ...

Our circulatory system, a complex network of blood vessels, capillaries, veins, and arteries, plays a critical role in delivering oxygen and nutrients to every cell in the body. When blood flows ...

Physical activity keeps the heart and circulatory system healthy and provides protection against numerous chronic diseases that affect the body and mind ... in addition to whole grains, legumes ...

Circulatory system Transport substances ... Carry messages for the body to work as a coordinated whole. Respiratory system Deliver oxygen for respiration and remove waste carbon dioxide.