2. Put the following structures in the proper order (#1-21) in which blood flows through the cardiovascular system. 1_ Right atrium Left ventricle 21_ Vena cava Pulmonary trunk Tricuspid valve Systemic capillaries Pulmonary capillaries Pulmonary arteries _19_ Systemic venules Right ventricle Aortic valve Aorta Pulmonary veins Mitral valve Systemic veins _17_ Systemic arterioles 9_ Pulmonary venules Pulmonary valve Left atrium Systemic arteries _7_ Pulmonary arterioles

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