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Heart Walls

1. Interatrical Septum -Separates two upper chambers

2. Interventricular Septum -separates two lower chamblers

Pericardial Structures

1. EndoCardium -Innermost lining of the heart wall and heart valves

2. Myocardium -Middle muscular layer of the heart wall (thickest)

3. Pericardium- Fibrous, membranous sac surrounding the heart (outer layer)

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1. Right Atrium- Blood enters here form the body

2. Right Ventricle- Blood leaves here on the way to the lungs

3. Left Atrium- Blood enters here from the lungs

4. Left Ventricle- Blood leaves here on the way to the body

Atria are the two UPPER chambers- receives blood into the heart

Ventricles are the two LOWER champers- send blood out of the heart

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1. Tricuspid valve -Between the right atrium and right ventricle

2. Pulmonary valve -Between the right ventricle and pulmonary artery

3. Mitral Valve -Between the left atrium and left ventricle

4. Aortic Valve -Between the left ventricle and the aorta

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1. Arteries -Take blood away from the heart, small arteries are called arterioles. most carry oxygenated blood.

2. Capillaries - microscopic blood vessels where gas exchange occurs; allows O₂ to enter the cells and picks up CO₂ from the cells

3. Veins -Brings blood back to the heart heart, have valves, small veins are called venules, most carry deoxygenated blood.

4. Easy way to remember:

Arteries = Away from heart

Capillaries = Connect everything

Veins = Visit the heart