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.' ...

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.