Topic 6.3 The Blood System

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Across
  1. 3. A deposit of fatty material on the inner lining of an arterial wall (6)
  2. 6. Nerve that brings signal to san from medulla of brain to slow down basic heart-beat (5)
  3. 7. ___________ node: A small mass of tissue that is embedded in the musculature of the right atrium, and that originates the impulses stimulating the heartbeat. (10)
  4. 9. Any of the minute veins connecting the capillaries with the larger systemic veins (6)
  5. 11. Nerve that brings signal to san from medulla of brain to speed up basic heart-beat (11)
  6. 13. ______________ circulation: Circulation system which brings blood to and from the lungs (9)
  7. 15. Prevent back-flow of blood in veins and ensure venous blood flows in one direction (6)
  8. 16. ______________ circulation: The branch of the circulatory system that supplies all body organs (apart from lungs) and then returns oxygen-poor blood to the right atrium via the veins. (8)
  9. 18. The large arterial trunk that carries blood from the left ventricle of the heart to be distributed by branch arteries through the body. (5)
  10. 21. Hormone secreted by the adrenal gland in response to stress. Also known as adrenaline. (11)
  11. 22. A tiny blood vessel where substances are exchanged between the blood and the body cells. (9)
  12. 23. __________________ valves: Valves located between the atrial and ventricular chambers on each side of the heart, prevent backflow into the atria when the ventricles are contracting. (16)
Down
  1. 1. The artery carrying blood from the right ventricle of the heart to the lungs (9)
  2. 2. Muscular wall dividing the left and right side of the heart. (6)
  3. 4. The two upper chambers of the heart (5)
  4. 5. Death of tissue due to lack of blood supply (10)
  5. 6. One of two large vessels (superior and inferior) that return deoxygenated blood to the right atrium of the heart. (4, 4)
  6. 7. Contraction phase of the heartbeat (7)
  7. 8. Blood vessel carrying blood away from the heart (6)
  8. 10. A blood vessel that carries blood back to the heart. (4)
  9. 12. Relaxation phase of the heartbeat (8)
  10. 14. Describes muscle tissue (heart muscle) that generates its own contractions. (8)
  11. 17. _____ - ______ valves: Valves in either side of the heart that controls exit from the ventricles, located at base of aorta and pulmonary artery (44685)
  12. 19. Elastic ___________: Highly elastic branched structures mostly made of the protein elastin which allows arteries to deform and reform (6)
  13. 20. Any of the small terminal twigs of an artery that ends in capillaries (9)
  14. 24. The two lower chambers of the heart (10)