Heart and Circulatory system

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Across
  1. 5. - A blood vessel that carries oxygenated blood away from the heart to the body.
  2. 6. - Red blood cells that transport oxygen throughout the body.
  3. 11. Cycle - The sequence of events in a single heartbeat, including phases of contraction and relaxation.
  4. 13. - A type of white blood cell that engulfs and digests bacteria and other harmful particles.
  5. 14. Node (Sinoatrial Node) - The heart's natural pacemaker, initiating each heartbeat and controlling heart rate.
  6. 17. - One of the two upper chambers of the heart that receives blood from the veins and pumps it into the ventricles.
  7. 18. - A blood vessel that carries deoxygenated blood toward the heart from the body.
  8. 19. Systole - The phase in the cardiac cycle where the ventricles contract, pushing blood out of the heart.
  9. 20. - The thin membrane that lines the inside of the heart chambers.
Down
  1. 1. Artery - The artery that carries deoxygenated blood from the right ventricle to the lungs for oxygenation.
  2. 2. - Platelets involved in the blood clotting process.
  3. 3. - A type of white blood cell that produces antibodies to fight infections.
  4. 4. - The liquid component of blood that carries cells, nutrients, hormones, and waste products.
  5. 7. Valves - Valves located at the bases of the large arteries leaving the heart, preventing backflow into the ventricles.
  6. 8. - One of the two lower chambers of the heart that pumps blood out to the body or lungs.
  7. 9. - Small blood vessels where the exchange of substances between blood and tissues occurs.
  8. 10. - A protein in red blood cells that binds with oxygen and gives blood its red color.
  9. 12. - White blood cells that are part of the immune system, helping to fight infections.
  10. 15. Systole - The phase in the cardiac cycle where the atria contract, pushing blood into the ventricles.
  11. 16. - The muscular wall dividing the left and right sides of the heart.