3.3 The Human Circulatory System

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Across
  1. 4. The side of the heart which receives oxygenated blood from the lungs
  2. 5. Deoxygenated blood from the body first enters into the right __________ of the heart
  3. 10. The liquid component of blood, containing dissolved nutrients and wastes, which makes up about 55% of blood volume.
  4. 11. Blood vessel that carries oxygenated blood from the lungs back to the heart.
  5. 13. These protect us from bacteria and other germs which may enter the blood and make us sick.
  6. 15. At the capillaries of the alveoli, oxygen enters the blood, and _________ ________ diffuses into the lungs.
Down
  1. 1. These have strong elastic walls, and transport blood away from the heart.
  2. 2. The only artery in the body which carries deoxygenated blood.
  3. 3. The component of blood which help with blood clotting if you are injured.
  4. 6. These contain haemoglobin to carry oxygen, and have a flattened shape for increased surface area.
  5. 7. Type of blood vessesl that have thinner walls, and valves to prevent the backflow of blood
  6. 8. Tiny, thin-walled blood vessels which deliver oxygen to the cells.
  7. 9. The lower two chambers of the heart.
  8. 12. Muscular organ which pumps blood around the body.
  9. 14. Once reaching the cells of the body, _________ exits the blood. CO2 and cellular waste products are picked up.