Fill in the Blanks Fill in the Blanks Circulatory System Bio 20Online version The system that helps and control the flow of the blood around the body. by Kirk Villanueva 1 right pulmonary cava capillaries vena heart capillaries oxygen vein alveoli circuit tissues venules Carbon left inferior systemic aorta ventricle arteries arterioles dioxide The circulatory system is composed of the , which pumps blood throughout the body , and blood vessels which are arteries , veins and . Deoxygenated blood enters the atrium through the and superior vena cava . The blood flows to the right which then pumps the blood through the artery . The blood enters the surrounding the where diffuses in the the bloodstream and into red blood cells . The blood leaves the lungs through the pulmonary and into the atrium and finally into the left ventricle . This end of the pulmonary and the the beginning of the circuit . The is the largest artery in the body and brings the blood through that become smaller and capillaries . Oxygen diffuses out of the bloodstream and into surrounding . enters the blood and is converted in carbonic acid . Capillaries become larger , then veins . These join together to form the and enter the right atrium .
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