Matching Pairs circulatory systemOnline version circulatory system by Luz Álvarez Herrero 1 4 2 5 3 3 4 1 5 6 6 2 The red cells drop carbon dioxide and take oxygen The blood goes from the hand to the heart The heart pumps blood to the lungs The blood returns to the heart The red cells drop oxygen and take carbon dioxide The heart pumps the blood from the heart to the body