Circulatory System

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Across
  1. 2. The stage of the cardiac cycle in which the heart relaxes and fills with blood.
  2. 3. Small blood cells that are important in blood clotting.
  3. 6. Arteries and veins can alter their diameter to “dilate” or “constrict” as a result of these layers.
  4. 8. These may be found in veins or in the heart; their function is to prevent backflow of blood within the circulatory system.
  5. 9. The liquid matrix of blood in which the cells are suspended.
  6. 15. One characteristic of blood vessels which allows them to expand their diameter as blood flow increases during a heart pump.
  7. 16. A gaseous reactant of cellular respiration.
  8. 20. The body system which transports required materials and waste products to and from all the cells in our body.
  9. 22. Materials required by cells in our body.
  10. 24. The transfer of blood from one individual into another; generally as an emergency procedure.
  11. 26. The hydrostatic force that blood exerts against the wall of a vessel.
  12. 27. One of the distinguishing differences between blood vessels.
  13. 28. One of two main factors regulated by the circulatory system.
  14. 29. The physiological control of various conditions in the body at a steady or set point value.
  15. 30. The stage of the cardiac cycle in which the heart contracts and pumps blood.
  16. 32. White blood cells; typically functions in immunity, such as phagocytosis or antibody production.
  17. 34. The blood type system for humans.
  18. 35. These carry the semi-fluid material within the circulatory system to all parts of the body.
Down
  1. 1. The steps involved in pumping blood into, though, and out of the heart.
  2. 4. Vessels that carry blood towards the heart from the organs of the body.
  3. 5. Small, “leaky” vessels that are found in regions of gas exchange within the circulatory system.
  4. 7. Blood pressure is measured as a ratio called this.
  5. 10. A gaseous waste product of cellular respiration.
  6. 11. A protein antigen on the surface of red blood cells.
  7. 12. Materials that must be removed from our body cells continuously to avoid building up to toxic levels.
  8. 13. One of two controls over heart muscle contractions.
  9. 14. These are components of the blood which are “white” or “red”.
  10. 17. Red blood cells; contain hemoglobin, which functions in transporting oxygen in the circulatory system.
  11. 18. One of two main factors regulated by the circulatory system.
  12. 19. Chemical messengers that are produced by a gland and transported to a target area by the circulatory system.
  13. 21. One of the main functions of white blood cells is to provide this response.
  14. 23. One of two controls over heart muscle contractions.
  15. 25. Vessels that carry blood away from the heart to the organs throughout the body.
  16. 31. The transport media for the circulatory system. A connective tissue with a fluid matrix called plasma in which cells are suspended.
  17. 33. A muscular pump which is used to circulate blood within the circulatory system.