# data[].attributes.body
when oxygen rich bloods comes from the lungs into the heart

# data[].attributes.body
oxygenated poor blood from the body goes into the heart through the vena cava

# data[].attributes.headline
septum dividing the heart and layers of the heart wall

# data[].attributes.subject
septum dividing the heart and layers of the heart wall

# data[].attributes.body
interatrial septum divides two upper chambers
interventricular septum divides two lower chambers

endocardium - interior wall
myocardium - middle wall
pericardium - outer wall

# data[].attributes.body
artia - two upper
ventricles - two lower

# data[].attributes.body
tricuspid valve
pulmonary valve
mitral valve
aortic valve

# data[].attributes.body
arteries
veins
capillaries