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THE HEART

THE HEART. LUNGS: Gas exchange. http://www.sumanasinc.com/webcontent/animations/content/human_heart.html. the external surface of the heart is covered with blood vessels – the coronary arteries and veins these provide food and oxygen for the muscle of the heart.

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THE HEART

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  1. THE HEART LUNGS: Gas exchange http://www.sumanasinc.com/webcontent/animations/content/human_heart.html

  2. the external surface of the heart is covered with blood vessels – the coronary arteries and veins these provide food and oxygen for the muscle of the heart

  3. there are 4 chambers inside the heart

  4. there are 4 chambers inside the heart 2 atria (singular atrium)

  5. RA LA there are 4 chambers inside the heart 2 atria (singular atrium)

  6. RA LA there are 4 chambers inside the heart 2 atria (singular atrium) 2 ventricles

  7. RA LA RV LV there are 4 chambers inside the heart 2 atria (singular atrium) 2 ventricles

  8. RA LA valves RV LV there are also valves that ensure the blood flows in the correct direction

  9. RA LA RV LV four blood vessels connect to the chambers of the heart

  10. pulmonary vein RA LA RV LV four blood vessels connect to the chambers of the heart 2 veins carrying blood to the heart

  11. vena cava pulmonary vein RA LA RV LV four blood vessels connect to the chambers of the heart 2 veins carrying blood to the heart

  12. vena cava pulmonary vein RA LA RV LV four blood vessels connect to the chambers of the heart 2 veins carrying blood to the heart 2 arteries carrying blood from the heart

  13. vena cava aorta pulmonary vein RA LA RV LV four blood vessels connect to the chambers of the heart 2 veins carrying blood to the heart 2 arteries carrying blood from the heart

  14. vena cava pulmonary artery aorta pulmonary vein RA LA RV LV four blood vessels connect to the chambers of the heart 2 veins carrying blood to the heart 2 arteries carrying blood from the heart

  15. RA LA RV LV if we just look at the left side of the heart as it beats..

  16. pulmonary vein RA LA RV LV

  17. pulmonary vein RA LA oxygenated blood from the lungs enters the left atrium via the pulmonary vein RV LV

  18. pulmonary vein RA LA oxygenated blood from the lungs enters the left atrium via the pulmonary vein RV LV

  19. pulmonary vein RA LA the left atrium contracts forcing blood through the valve into the left ventricle RV LV

  20. pulmonary vein RA LA the left atrium contracts forcing blood through the valve into the left ventricle RV LV

  21. pulmonary vein RA LA the left atrium contracts forcing blood through the valve into the left ventricle RV LV

  22. pulmonary vein RA LA the left atrium contracts forcing blood through the valve into the left ventricle RV LV

  23. pulmonary vein RA LA the left atrium contracts forcing blood through the valve into the left ventricle RV LV

  24. aorta pulmonary vein RA LA the left ventricle contracts forcing blood out of the aorta to the body the valve stops the blood flowing back into the left atrium RV LV

  25. aorta pulmonary vein RA LA the left ventricle contracts forcing blood out of the aorta to the body the valve stops the blood flowing back into the left atrium RV LV

  26. aorta pulmonary vein RA LA the left ventricle contracts forcing blood out of the aorta to the body the valve stops the blood flowing back into the left atrium RV LV

  27. aorta pulmonary vein RA LA the left ventricle contracts forcing blood out of the aorta to the body the valve stops the blood flowing back into the left atrium RV LV

  28. aorta pulmonary vein RA LA the left ventricle contracts forcing blood out of the aorta to the body the valve stops the blood flowing back into the left atrium RV LV

  29. RA LA RV LV

  30. RA LA the left side of the heart receives oxygenated blood from the lungs and pumps it around the body RV LV

  31. RA LA the right side of the heart receives deoxygenated blood from the body and pumps it to the lungs to be oxygenated RV LV

  32. The heart is divided into right and left sides RIGHT SIDE of heart Receives and pumps DEOXYGENATED BLOOD LEFT SIDE of heart Receives and pumps OXYGENATED BLOOD 4 chambers ATRIA receive blood fromVEINS VENTRICLES pump blood away from heart in ARTERIES LORD

  33. Blood Vessels • The blood circulates around the body more than a thousand times a day • Arteries • Arterioles • Capillaries • Venules • Veins

  34. Blood Vessels: Arteries • Carry blood Away from the heart • Carry oxygenated blood – except for the pulmonary artery which is going to the lungs to be re-oxygenated • Have thick, elastic walls to withstand high blood pressure • The blood moves in pulses due to the pumping action of the heart

  35. Arterioles • Smallest arteries • Made mostly of smooth muscle • This means the diameter can vary, so blood can be diverted to where it is most needed.

  36. Blood Vessels: Veins • Carry blood back to the heart – gravity means this is not an easy job! • Carry deoxygenated blood • Have thin walls because the blood travels at low pressure • Muscles around the veins contract to help move the blood back towards the heart • Veins have one-way valves to stop blood flowing backwards

  37. Veins & Valves

  38. Artery vs. Vein Structure Larger Lumen (space in middle) – less resistance to blood flow Thick muscular & elastic wall – gradually reduces the harsh surge of blood to a steadier flow

  39. Blood Vessels: Capillaries • Join arteries to veins • Very tiny blood vessels that reach all the cells of the body – thin permeable walls • Capillaries provide cells with “food”, oxygen & water and remove wastes like carbon dioxide

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