Across
- 6. This is used to record electrical changes in the heart muscle as it beats
- 7. The middle layer of the heart wall
- 8. The largest blood vessels that carry blood away from the heart
- 11. The smallest type of blood vessels that are only one cell thick
- 12. These arteries take blood to the head and neck
- 13. The fibrous sac surrounding the heart
- 14. The walls of the heart between the chambers are called this
Down
- 1. These are the only veins in the body that carry oxygen rich blood back to the heart (2 words)
- 2. Blood pressure is measured with this device
- 3. The upper chambers of the heart
- 4. This is responsible for initiating the beat of the heart (2 words)
- 5. The lower chambers of the heart
- 9. These blood vessels have thinner walls than arteries and carry blood toward the heart
- 10. The smooth layer of cells that line the interior of the heart