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Veins: Carry deoxygenated blood to the heart

Arteries: Carry oxygenated blood away from the heart

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Four of them...

1. Tricuspid valve: separates Right atrium from Right Ventricle

2. Pulmonary valve: separates right ventricle from pulmonary valve

3. Mitral valve: separates left atrium from left ventricle

4. Aortic valve: separates left ventricle from the aorta

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Four of them:

1. Right atrium: receives deoxygenated blood from the vena cava

2. Right ventricle: pumps out deoxygenated blood to the lungs through the aortic valve

3. Left atrium: receives oxygenated blood from the lungs

4. Left ventricle: pumps out oxygenated blood to the body via the aorta

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Deoxygenated blood

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Oxygenated blood

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Deoxygenated blood

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Interatrial septum: divides the left and right atria

Interventrical septum: divides the left and right ventricles

Endocardium: inner lining of the heart

Myocardium: thickest, muscular middle layer of the heart that makes it contract

Pericardium: membrane surrounding the heart