circulatory system

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Across
  1. 1. a very small blood vessel that connects arterioles (small arteries) to venules (small veins)
  2. 3. a large vein that returns deoxygenated blood to the heart.
  3. 5. an architectural space, an entry chamber in the heart, or a cavity in other biological systems.
  4. 7. a chamber or cavity, either in the heart or the brain
  5. 8. a small, colorless cell fragment in the blood that plays a crucial role in blood clotting.
  6. 11. a white blood cell, also known as a white blood corpuscle, that plays a crucial role in the body's immune system.
  7. 12. blood vessels that carry oxygen-rich blood from the lungs back to the heart
  8. 13. a blood vessel that transports deoxygenated blood from the heart to the lungs.
  9. 14. the muscular middle layer of the heart wall
Down
  1. 2. double-walled sac of tissue that surrounds the heart and the roots of the great blood vessels.
  2. 4. a thick-walled blood vessel that carries oxygenated blood away from the heart to the rest of the body
  3. 5. the body's main artery, a large blood vessel that carries oxygen-rich blood from the heart to the rest of the body.
  4. 6. a type of blood cell responsible for carrying oxygen to the body's tissues and transporting carbon dioxide back to the lungs.
  5. 9. the innermost layer of tissue lining the heart's chambers and valves.
  6. 10. a blood vessel that carries blood towards the heart