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Septum: partition or wall dividing a cavity
Interatrial septum: separates 2 upper chambers (atria)
Inter ventricular septum: separates two lower chambers (ventricles)

Layers of the heart:
Epicardium: the outer lining of the heart
Myocardium: the muscular middle layer of the heart
Endocardium: the inner lining of the heart

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left atrium: receives oxygenated blood from the lungs and pumps it to the left ventricle
right atrium: receives deoxygenated blood from the body and pumps it to the right ventricle
left ventricle: pumps the deoxygenated blood to the lungs
right ventricle: pumps the oxygenated blood to the body

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Tricuspid valve: located between the right atrium and right ventricle
Pulmonary valve: valve positioned between the right ventricle and pulmonary artery
Mitral valve: valve between the left atrium and left ventricle (also known as a bicuspid valve)
Aortic valve: located between the left ventricle and aorta

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Arteries: carries blood AWAY from the heart
Veins: carries blood TO the heart
Capillaries: small vessels that connect arteries and veins