Circulatory System

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Across
  1. 1. The smallest blood vessel where oxygen and nutrients exchange with cells.
  2. 3. The red liquid that carries nutrients, gases, and waste.
  3. 6. A thick-walled vessel that carries blood away from the heart.
  4. 7. The organ made of cardiac muscle that acts as a continuous pump.
  5. 8. Vessels with valves that carry blood back toward the heart.
Down
  1. 2. The rhythmic throbbing felt in your wrist or neck as the heart pumps.
  2. 4. The gas absorbed by blood in the lungs and carried to the body.
  3. 5. Flaps inside veins and the heart that keep blood flowing in one direction.