Circulatory system 2010


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Circulatory system 2010

  1. 1. Circulatory System<br />
  2. 2. What is the circulatory system?<br /><ul><li> The circulatory system carries nutrient and wastes around the body.
  3. 3. The Heart and blood vessels together make up the</li></ul>Circulatory System.<br />
  4. 4. How does this system work?<br />lungs<br />pulmonary artery<br />pulmonary vein<br />head & arms<br />aorta<br />main vein<br />Left <br />Right<br />liver<br />digestive system<br />kidneys <br />legs <br />Circulatory System<br />
  5. 5. Lungs<br />Body cells<br />Our circulatory system is a double circulatory system. <br />This means it has two parts parts. <br />the right side of the system <br />deals with deoxygenated blood.<br />the left side of the system <br />deals with oxygenated blood.<br />
  6. 6. The Heart<br />Artery to Head and Body<br />Artery to Lungs<br />Vein from Head and Body<br />Vein from Lungs<br />Right Atrium<br />Left Atrium<br />valve<br />valve<br />Left Ventricle<br />Right Ventricle<br />
  7. 7. The heart beat begins when the<br /> heart muscles relax and blood<br /> flows into the atria.<br />How does the Heart work?<br />STEP ONE<br />
  8. 8. The atria then contract and<br /> the valves open to allow blood<br /> into the ventricles.<br />How does the Heart work?<br />STEP TWO<br />
  9. 9. The valves close to stop blood<br />flowing backwards.<br />The ventricles contractejecting blood from the heart.<br />At the same time, the atria are<br />Relaxing again and filling with<br />blood.<br />How does the Heart work?<br />STEP THREE<br />The cycle then repeats.<br />
  10. 10. The ARTERY<br />-carry blood away from the heart.<br />the elastic fibres allow the artery to stretch under pressure<br />thick muscle and elastic fibres<br />the thick muscle can contract to push the blood along.<br />
  11. 11. The VEIN<br />Veins carry blood towards the heart.<br />veins have valves to stop the blood from going in the wrong direction.<br />thin muscle and elastic fibres<br />body muscles surround the veins so that when they contract they squeeze the veins and push the blood along the vessel.<br />
  12. 12. The CAPILLARY<br />Capillaries link Arteries with Veins<br />they exchange materials between the blood and other body cells.<br />the wall of a capillary<br />is only one cell thick<br />
  13. 13. SUMMARY<br />Arteries take blood ______ from the heart. The walls of an artery are made up of thick _________ walls and elastic fibres. Veins carry blood ________ the heart and also have valves. The _________ link arteries and veins, and have a one cell thick wall. <br />away<br />muscular<br />towards<br />capillaries<br />
  14. 14. Heart Beat<br />Measure in bpm, beats per minute.<br /> Specialised tissues produce electrical signals which flow down through the heart, causing the atria to contract, then the ventricles.<br />
  15. 15. ECG - Electrocardiogram<br /> Used for diagnosis.<br />
  16. 16. Normal sinus rhythm<br /> Between 60 and 100 bpm<br /> Regular electrical signal that stimulates rhythmic contractions of the cardiac muscle <br />
  17. 17. Bradycardia<br />Brady=Slow<br /><60bpm<br />
  18. 18. Pacemaker<br />Helps heart keep pace if heart rhythm is too slow<br />
  19. 19. Tachycardia<br />Tachy = Fast<br />>100bpm<br />
  20. 20. Atrial Fibrillation<br />Erratic electrical signals prevent the atria from relaxing (filling) and contracting (ejecting)<br />
  21. 21. Ventricular Fibrillation<br />Erratic electrical signals prevent the ventricles from relaxing and contracting. <br />Can be lethal in minutes! An electric shock is required to restore normal rhythm.<br />
  22. 22. Defibrillator<br />
  23. 23. Implantable Defibrillator<br /> Sends an electric shock directly into the heart. <br /> Restores normal sinus rhythm if in ventricular tachycardia or ventricular fibrillation. <br />