Fill in the Blanks The circuit of red blood cellOnline version The circuit of red blood cell by Alba Castellano Navarro 1 The circuit of red blood cell begins in the where it collects and leaves . It passes through the and enters in the heart through the . It passes into the through the valve and exits through the valves to the . This artery divides into thinner vessels called and arrive to every cell of the body where the red blood cell leaves the and collects the . It passes through the and enters of the heart . It passes into the through the valve and exits through the valves to the . It reaches the lungs and starts the circuit again .