Blood Vessels

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  • Blood Vessels
    • Arteries: Carry blood away from the heart, Carry oxygenated blood, Don't have valves apart from ones in heart, have a thick layer of muscles, Small space inside, Blood flows at high pressure due to the action of the heart,
    • Capillaries: Connect Arteries and Veins, Carry both oxygenated and deoxygenated blood, Dont have valves, Walls are very thick, Tiny vessels in close contact to cells, Low blood pressure and slow speed to allow exchange of materials.
    • Veins: Carry blood towards the heart, Carry deoxygenated blood, Have valves to stop the backflow of blood, Thin layer of muscle, Large space inside, Blood flows at low pressure.
    • Right Atrium: Right chamber of heart, receives deoxygenated blood from all over the body.
    • Left Atrium: Left Atrium one of the four chambers in the human heart. It receives oxygenated blood from the Pulmonary Vein.
    • Atrio-Ventriclar Valves: Acts as a control device between the Atria and the ventricles. Prevents blood from moving back into the Atria during contraction.
    • Right Ventricle: Takes in deoxygenated blood and pumps it in to the Pulmonary Artery where it is taken to the lungs for reoxygenation.
    • Left Ventricle: Pumps blood around the body, Systematic Circulation and the right ventricle pumps blood to the lungs, Pulmonary Circulation.
    • Semi-Lunar Valves: Controls the flow of blood coming back into the Right Artrium.
    • Musclular Walls: They endure high pressure from the blood.
    • Aorta: Largest artery in the body, arises from the Left Ventricle of the Heart. It ends by dividing into two arteries. They supply body parts with oxygenated blood.
    • Vena Cava: There is a superior and inferior Vena Cava, both are large veins. The superior returns blood to the Heart from the head, neck and upper limbs. The inferior Vena Cava returns blood to the heart from the lowest part of the body.
    • Pulmonary Artery: Carry blood from the Heart to the lungs, to drop off Carbon Dioxide and pick up Oxygen. Carries deoxygenated blood from the Heart to the lungs.
    • Pulmonary Vein: Big blood vessels that usally carry oxygenated blood to the Heart's Left Atrium from the lungs.
    • SAN: Eletrical impulses.
    • Bundle of His: A bundle of modified heart muscle that transmits the cardiac impulse from the atrioventicular mode to the ventricles causing them to contract.
    • Purkynje Fibres: Specialised muscle fibres found in the heart. They origin at the atrioventricular bundle and extend into the ventricles. They conduct impulses from the bundle to the ventricles, causing AV node to ventricles.


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