Respiratory and circulatory system

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Across
  1. 3. – the largest artery in the body that carries oxygenated blood from the heart to the body
  2. 5. – the main muscle that contracts to allow the lungs to expand during breathing
  3. 6. – the windpipe that carries air from the throat to the lungs
  4. 10. – a blood vessel that carries blood away from the heart
  5. 12. – the process of exchanging oxygen and carbon dioxide between the body and the environment
  6. 13. – the two main airways that branch from the trachea into the lungs
Down
  1. 1. – the liquid part of blood that carries nutrients, hormones, and waste products
  2. 2. – a blood vessel that carries blood toward the heart
  3. 4. – relating to the smaller airways that branch from the bronchi into each lung
  4. 7. blood cells – blood cells that carry oxygen using hemoglobin
  5. 8. – tiny air sacs in the lungs where gas exchange occurs
  6. 9. – the gas absorbed by the blood in the lungs for cellular respiration
  7. 11. – the organ that pumps blood around the body