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1. Arteries: Take blood away from the heart and contain the highest blood pressure. Have thick walls to compensate.

2. Arterioles: Smaller diameter than arteries, carry blood into capillaries.

3. Capillaries: Where exchange occurs. Form capillary beds to increase surface area for this exchange.

4. Venules: Retrieve blood from capillaries.

5. Veins: Return blood to the heart. They have the biggest diameter of the vessels and contain the lowest blood pressure. Can store blood with the help of valves.

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Atrioventricular Valves:

1. Tricuspid Valve: Controls flow between the Right Atrium and Right Ventricle

2. Mitral Valve: Controls flow between the Left Atrium and Left Ventricle

Semilunar Valves:

1. Pulmonary Valve: Controls flow between Right Ventricle and the Pulmonary Artery

2. Aortic Valve: Controls flow between Left Ventricle and the Aorta

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1. Right Atrium: Receives deoxygenated blood from the IVC and SVC and pumps into the right ventricle.

2. Right Ventricle: Receives blood from right atrium and pumps it into the lungs

3. Left Atrium: Receives oxygenated blood from the lungs and pumps into the left ventricle.

4. Left Ventricle: Receives from left atrium and pumps into Aorta (and rest of the systemic circuit).

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Layers:

Pericardium: Outermost layer, fibrous sac

Myocardium: Contains muscle fibers used for contraction.

Endocardium: Lines the inside of the heart.

Septa:

Interatrial Septum: Divides right and left atria

Interventricular Septum: Divides right and left ventricles

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Collects deoxygenated blood from lower limbs

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Collects deoxygenated from upper limbs

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aka. Bicuspid