WWA - Week 3 - Vocabulary

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Across
  1. 2. The red liquid containing oxygen and nutrients that pumps through the veins and arteries of humans and many other animals.
  2. 4. Blood vessels that carry blood back to the heart.
  3. 7. A wall of muscle that separates the chest and abdomen in humans and certain animals.
  4. 8. A tiny blood vessel where substances are exchanged between the blood and the body cells.
  5. 10. The organ that pumps blood through the body of a person or animal.
Down
  1. 1. A gas that is expelled from the body by the respiratory system.
  2. 3. A group of parts that work together as a whole.
  3. 5. Blood vessels that carry blood away from the heart.
  4. 6. The tube that carries air to the lungs in humans and other animals that breathe air; windpipe.
  5. 9. Main organs of the respiratory system. They bring oxygen to the body and get rid of carbon dioxide.