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