Relier Pairs circulatory systemVersion en ligne circulatory system par Luz Álvarez Herrero 1 3 2 1 3 2 4 6 5 4 6 5 The red cells drop oxygen and take carbon dioxide The heart pumps blood to the lungs The blood returns to the heart The heart pumps the blood from the heart to the body The red cells drop carbon dioxide and take oxygen The blood goes from the hand to the heart