Path of Blood Through the Heart

Blood that is low in oxygen and high in carbon dioxide enters the right atrium through the venae cavae and the coronary sinus. As the right atrial wall contracts, the blood passes through the right atrioventricular orifice and enters the chamber of the right ventricle (fig. 15.10).

Pulmonary valve

Superior vena cava pulmonary artery

Branches of right pulmonary veins

Right Atrioventricular Orifice

Chordae tendineae

Papillary muscle Left ventricle

Interventricular septum

Superior vena cava

Pulmonary valve pulmonary artery

Branches of right pulmonary veins

Aorta

Left pulmonary artery

Pulmonary trunk

Left pulmonary veins

Left atrium

Bicuspid valve

Chordae tendineae

Papillary muscle Left ventricle

Interventricular septum

Superior vena cava Pulmonary valve Aortic valve

Right pulmonary artery

Branches of _

right pulmonary veins

Right atrium

Opening of coronary sinus

Tricuspid valve Right ventricle Inferior vena cava

Papillary Muscle

Interventricular septum

Aorta

Left pulmonary artery

Pulmonary trunk

Left pulmonary veins

Left atrium Bicuspid valve Chordae tendineae

Papillary muscle Left ventricle

Interventricular septum

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