Circulatory System

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Across
  1. 3. This muscle in your upper arm helps bend your elbow.
  2. 4. The upper chamber of the heart that receives blood returning to the heart.
  3. 6. This blood vessel that carries blood away from the heart.
  4. 7. This is the largest artery in the body, carrying oxygenated blood from the heart to the rest of the body.
  5. 10. This digestive tube connects your mouth to your stomach.
  6. 11. A type of blood vessel that carries blood toward the heart.
Down
  1. 1. A protein in red blood cells that carries oxygen.
  2. 2. These tiny vessels connect arteries to veins and allow exchange of gases and nutrients.
  3. 5. This muscular heart chamber pumps blood out to the lungs or body.
  4. 7. These tiny air sacs in the lungs are where oxygen and carbon dioxide are exchanged.
  5. 8. This type of cell sends messages through your nervous system.
  6. 9. The watery part of blood that carries nutrients, hormones, and waste.